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Today I got accused by my professor of cheating and copying two reports I submitted. I had a formal meeting with the professor where he tried to push me into admitting I cheated by showing me the surprising similarities. Even though I continuously denied it, he went forward to go to a formal hearing in the university where a panel will judge the outcome. I am currently freaking out. I know I did not cheat from anybody and I feel like the similarity could be due to a similar thought process (which sounds ridiculous). Should I just say that I did not cheat and stick with it? Or should I ask if I can redo the reports (though it sounds suspicious)? The reports were 68 percent similar and I feel like the odds are against me even though I did not do anything.

Edit: the software used was turnitin and I do not hav access to the original files to get time stamps. I literally can only deny the allegations. The only reasonable explanation is that the professor taught us in a similar manner and our report writing manner was similar due to the fact we have taken the same courses a year apart and had the same professors who molded our report writing skills.

Ballislyf
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    You're best off being honest, and sticking to your story if it's true. If you start trying to make amends then that just makes you look guilty. – Nico Burns Nov 01 '19 at 13:31
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    Did you discussed with anyone your assignments? Did anyone tutor you? – Nick S Nov 01 '19 at 14:31
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    "The reports were 68% similar." Is this an arbitrary calculation, or was 68% of your report word-for-word identical with the previous year's report? Is this true of both the reports you submitted. – DJClayworth Nov 01 '19 at 15:17
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    Surprising similarity with what? What is the benchmark? Would you please clarify what the ground truth is? It would be also valuable to specify which area of study you are involved in, although very generally. – XavierStuvw Nov 01 '19 at 15:48
  • If you have a student union at your university, they probably have experience with the process and can help you with the best way to proceed – llama Nov 01 '19 at 15:56
  • Comments are not for extended discussion; this conversation has been moved to chat. – Massimo Ortolano Nov 01 '19 at 19:45
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    Are the reports so similar because they are from identical experiments (during a prior term)? There are only so many ways to record results, and if the labs were both performed correctly, it seems entirely plausible you got close-to-identical results to at least one person from a prior term. Even more, has the professor instructed you to write up your lab reports in a specific way? If so, that may add to your evidence that the similarity is coincidental. – BradC Nov 01 '19 at 20:07
  • How is it 68% similar? Does your professor have some sort of software that determines that? If so, then it sounds like you and another student copied work from the same source. C'mon bro, what really happened here? Can you clarify what the 68% is? – Issel Nov 01 '19 at 20:40
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    Is the report free-form or you were filling a lab report template? Did you include any mandatory (boilerplate) content like the description of the experiment or safety directions? – Džuris Nov 01 '19 at 21:13
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    I was with you until "68 percent similar*... – Apollys supports Monica Nov 02 '19 at 01:54
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    If the 68% value is determined by a specific algorithm, can you inquire about the distribution of other reports? I would expect inverse dissimilarity to follow a gamma distribution. Are your reports statistical outliers or just part of the long tail? – MooseBoys Nov 02 '19 at 03:53
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    the software used was turnitin and I do not hav access to the original files to get time stamps. I literally can only deny the allegations. The only reasonable explanation is that the professor taught us in a similar manner and our report writing manner was similar due to the fact we have taken the same courses a year apart and had the same professors who molded our report writing skills. – Ballislyf Nov 02 '19 at 16:57
  • Are the human judges in the hearing going to be personally inspecting the two reports? I hope so. If they do that, and if they are unbiased, it seems likely that they should be able to recognize and understand why turnitin has given a false positive (assuming that it truly is a false positive). I would ask them to also give you a chance to review the reports, while they are present, so that you can understand what has caused the false alarm. – littleO Nov 03 '19 at 07:18
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    Why do you not have access to the original files, or earlier versions? (This question will probably come up). Personally: if you did it, admit it. – lalala Nov 03 '19 at 09:11
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    The professor should have gone through your thought process of why you wrote the report the way you did. And if your explanation made sense, they should've let it go. – Akavall Nov 03 '19 at 21:22
  • If you used a Mac with Time Machine turned on you might have old versions in your weekly backups or daily backups up to 30 days. – gnasher729 Nov 04 '19 at 09:55
  • @DJClayworth I've given a bit more information about Turnitin's scoring, in what was going to be a comment to you but turned into a sort-of answer – Chris H Nov 04 '19 at 10:14
  • Are there any updates on this? Did you go through the ethic committee hearing? – jerlich Jan 13 '20 at 06:53

10 Answers10

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In this kind of hearing, evidence will be paramount. "I know I did not cheat" isn't sufficient - that's just a denial. You need more, e.g.:

  • Can you show that you could not possibly have known about these 2 reports?
  • Do you have drafts of the report, preferably with time stamps, as you were writing it?
  • Did you work with anyone else? If so, can they vouch for you?

Offering to redo the reports won't work unfortunately - at this point, it's about academic integrity, not about the grade you get. It's likely advisable to get advice from someone familiar with your department and the academic integrity process, e.g. a faculty member you trust, or student counselors if available.

You might be interested in related questions such as this and this.

Allure
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    Yes, evidence is the key here. Drafts, notes, proof you accessed library resources on certain dates, the change log on any files, etc etc. Thinking about the last thing I wrote, I could produce an email where I laid out the idea, the library record where I accessed a digital version of the main source, my notes on the main source with time stamps, the record showing me checking out that physical book, a WhatsApp conversation where I talk about what I'm working on, and the file of the writing in various stages (thanks to the auto backups taken along the way). Gather that level of proof. – GrotesqueSI Nov 01 '19 at 07:59
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    Ah, but evidence might be impossible to obtain. Good if you have it, but who is so paranoid that they collect it for assignments. – Buffy Nov 01 '19 at 13:36
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    Isn't "innocent until proven guilty" the norm? I surprised that the accused needs more evidence than the accuser. – vsz Nov 01 '19 at 14:14
  • Let us continue the discussion about theories of law in chat. – cag51 Nov 03 '19 at 19:25
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Firstly, use version control. It's quite likely that you've produced your report in either MS Word, Libre Office or Google Docs. All of these programs store old revisions, although Google Docs stores all of the revisions while Word and Libre Office only a limited number. If you're able to produce evidence of partial work, it'll be clear you've produced the report yourself instead of copying it from previous work.

See for example https://www.dummies.com/software/microsoft-office/word/view-older-version-word-2016-document/ for accessing old versions of a Word document. Warning: only a limited number of revisions are stored, so don't save the document again as it will overwrite the oldest versions! If you exported your work as a PDF multiple times, look in the Trash Bin - there may be additional files there.

If you used LaTeX, you might have to use a digital forensics program, such as Autopsy, to recover deleted PDFs and scrub through a sea of deleted documents it recovers to find a previous version of this document.

Secondly, remember that you're innocent until proven guilty. It's the professor who needs to convince the panel that you cheated and not the opposite. Do not accept the professors framing of the situation.

Syfer Polski
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    Most of your suggestions don't work. It is now too late. And innocent until proven guilty is only in, for example, the US court system. But, no, don't accept the framing if it is incorrect. – Buffy Nov 01 '19 at 13:35
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    If you use LaTeX, then you're actually much better off because it's better suited for using a proper dedicated VCS like Git, which is guaranteed to store the whole history. (Of course this doesn't help after the fact, it's a decision that needs to be done up front. Everybody should use VCS, unfortunately it's not commonly taught except in CS.) – leftaroundabout Nov 01 '19 at 14:27
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    @leftaroundabout: Not only intentional version control software, but implicit version control via cloud storage, can work well with any of these formats. Sure, text-based markup like LaTeX makes diffs much more readable, but for the purpose at hand just being able to retrieve prior versions is sufficient. – Ben Voigt Nov 01 '19 at 21:22
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    I do not think version control is essential. A student will have some memories how they came up with the ideas, logic and in which order. If they could express them in a coherent way, I would tend to believe that far more, even without some git history, than some no-further-detailed assurances that this is their own work. Honest students can often tell narratives how they got to their conclusions, even if not particularly deep. If they cannot, this is a strong indicator for a fake - the git repository may even be faked after the fact by some helper in case of a disciplinary hearing. – Captain Emacs Nov 02 '19 at 00:23
  • @leftaroundabout If anything, version control is a much worse proof than say a Google docs history, since it's utterly trivial to fake such a history if you wanted to (depending on the detail, lots of work, but certainly doable). – Voo Nov 02 '19 at 17:55
  • @Voo indeed it is trivial to fake a history; faking one that's convincing upon some scrutiny isn't. It's still doable, perhaps even easy, but quite a lot of work. And having forged such a history is kind of proof of work too... – leftaroundabout Nov 02 '19 at 17:59
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    @leftaroundabout Just saying (as someone who wrote all their papers with LaTeX, checked into a git repository) that in this particular case Google Docs would actually be a pretty fool proof way to show that you did the work yourself. Although imaging writing a paper in Word or gdocs makes me shiver. – Voo Nov 02 '19 at 18:01
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    @Voo Yeah, indeed! I wonder if there are online services that can somehow “certify” a git repo, in the sense that they only accept pushing commits with timestamp in e.g. the previous 48 hours. Github, Gitlab or Bitbucket don't do that. – leftaroundabout Nov 02 '19 at 18:03
  • @leftaroundabout I'd think using Pull Requests with e.g. GitHub would work for this (I'm reasonably sure that the PR itself would be timestamped by GitHub), but rather cumbersome. Not an uninteresting idea. There might really be an idea for a service in there! – Voo Nov 02 '19 at 18:05
  • @leftaroundabout: s/much better suited/a little better suited/. git records changes by line. In LaTeX, a line is often a 200-or-more-word paragraph. – einpoklum Nov 02 '19 at 18:15
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    @einpoklum-reinstateMonica that's getting off-topic here. I actually put a (single!) line break after every or every second sentence in my LaTeX files, one of the reasons being precisely that it makes the diffs nicer. – leftaroundabout Nov 02 '19 at 18:48
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    @einpoklum I agree with leftroundabout that it's kind of irrelevant how Git records changes; all that matters is that it can show you a snapshot of what the content was (claimed to be) at a particular time. For the purposes of the situation in this question, people probably aren't very interested in the diffs. – David Z Nov 03 '19 at 02:58
  • @CaptainEmacs: Exactly; fair teachers can almost always determine the truth in any cheating case. Unfortunately, many teachers are unfair. – user21820 Nov 03 '19 at 11:07
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    @einpoklum very offtopic but I think it's worth mentioning: You should read up on semantic linefeeds. It's not much taught, but it's an amazing concept for every kind of documentation or LaTeX documents and really makes a difference. – Voo Nov 03 '19 at 13:17
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I've read the above answers, and they seem to give pretty good advice, but I have some more for you that isn't about procedures of college, but on personal etiquette and experience when being questioned by those who have authority.

In the military we say, "He who yells first has lost the argument."

When you go into this, have your facts ready, and find some way to keep your calm. If you are freaking out as you say, this can easily be misconstrued as acting in a guilty manner. When you are in front of them, treat it like a soldier would at a military board. Listen to their questions carefully, do not interrupt them, answer their questions truthfully, support your statements if possible, and correct any inconsistencies in their facts as you find them.

In short you are having a logical argument with them, and if you can find a weakness in their argument you can use that to unravel their argument or cast doubt on it's validity.

Most importantly though, you cannot do this if you are freaking out.

Also, remember, if one of them yells first or gets upset, you've won the argument. You kept your cool, and now have a means to attack their argument, or show that it is not logically sound, but emotionally driven.

Chthonic One
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    Students can freak out even if they are not guilty. They are less experienced than the plagiarism hunters – Captain Emacs Nov 02 '19 at 00:35
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    Imagine spending 10s of thousands of dollars, investing thousands of hours, to be told that a computer says you cheated and you are under investigation by a huge organisation. It is completely normal to be freaked out. You can't win with logic and composure because this is not an argument between peers. The people who accuse you are the ones you have to convince are innocent. If they lose their cool and shout, then they are sufficiently emotionally invested that you have already lost. Have you won a logical argument with someone who is yelling at you and whom also gets to decide who wins? –  Nov 02 '19 at 01:42
  • @jgn Yes (not yelling, but reacting badly). – Captain Emacs Nov 02 '19 at 12:58
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    @CaptainEmacs Glad to hear that I guess, I wouldn't rely on it though! –  Nov 02 '19 at 13:19
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    If a private goes into a review with an NCO who claims he did wrong and his commander, and the NCO starts to try to yell in order to make the private admit he did wrong, often times the commander who did not witness the scene will pick up on things the NCO let slip. If the private continues to keep his bearing, this can only reflect well for him. In an academic situation, you could use this fact that the other party was yelling and badgering you to press that he is trying to bully you, to either the others present, or those above them after, like the dean. – Chthonic One Nov 03 '19 at 15:50
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Find an advocate to support you. Some universities have an office (ombudsman) for this. In other places a student organization provides help. You may even need a lawyer if you are able to afford one. Another professor who trusts you might be able to help.

Papers were similar. It happens. I assume that whoever did the previous work had the same teacher, with the same lectures, and the same written materials (books, etc). Students were actually encouraged to think in a certain way.

Instructors should make sufficient changes from year to year that this sort of situation is impossible. Lazy professors lead to spurious charges.

If you have evidence, of course, present it. Insist on your innocence. Complain to the department head or the dean.

If you have to ask for the chance to do it over, ask that someone else set the assignment and evaluate it. Ask the department head.

Buffy
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    If using the same preparation material is the case, then the high similarity would strongly suggest that both students insufficiently cited those preparation materials while copying them too closely. – Scott Seidman Nov 01 '19 at 14:02
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    @ScottSeidman, you are being quite speculative here. We haven't seen the assignments and have no knowledge of the scope. – Buffy Nov 01 '19 at 14:04
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    I don't think so. 68% similarity is VERY big. It does not happen by chance. In my answer, I've provided the only other process I can think of that would result in similarity that high. – Scott Seidman Nov 01 '19 at 14:07
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    @ScottSeidman, you haven't seen the assignment or the solutions. So 68% is just noise here. Nor do we know who made the assessment of that number. – Buffy Nov 01 '19 at 14:09
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    I've seen how these similarity reports are generated, using three or four different software tools, in the context of academic honesty hearings. I have seen these numbers boosted by in-text citations that use authors names and dates, as well as reference lists, but assume that the prof would have noticed this. My experience is that 68% is a large number, regardless of the tool used. I have no trouble believing that the student did not copy an old report, but the description certainly has me scratching my head at the student's process. – Scott Seidman Nov 01 '19 at 14:15
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    @ScottSeidman, and my head is itchy over the professor's process. – Buffy Nov 01 '19 at 14:17
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    No need for it to itch over that. The prof used a plagiarism detection tool, and it spat out the number 68%. You could criticize the prof for reassigning multiple times. That might be poor pedagogy, but it is not a license for students to cheat. – Scott Seidman Nov 01 '19 at 14:20
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    -1 for demands to get a lawyer and that all instructors must not re-use assignments or be charged with laziness, etc. Way off base. – Daniel R. Collins Nov 01 '19 at 15:29
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    I agree with @DanielR.Collins but finding a representative is the single most important piece of advice in this thread and the only thing that will work. –  Nov 01 '19 at 16:51
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    "Instructors should make sufficient changes from year to year that this sort of situation is impossible." That's not an appropriate note in this case. It's completely normal to have the just a single kit for the Compton scattering, Frank-Hertz experiment or measuring Brewster's angle. Students will do the same experiment with the same guidelines and filling the same form year from year. The only error here is to put the lab report in a plagiarism checking tool. – Džuris Nov 01 '19 at 21:11
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    @Džuris, actually the OP hasn't described the nature of the "lab". It could be a lot of things. And is the named experiment so boring that only one set of things can be asked about it? If so, how are similar answers not inevitable. We also don't have a definition of the 68% similar or any way to judge its validity. There are far too many assumptions being made here. – Buffy Nov 01 '19 at 21:33
  • @Džuris Even with those experiments somewhere it is just a form you fill but in our place we always wrote a report in a form of a paper. Several pages with a theoretical introduction and methods, results, discussion, conclusion. There was a lot of potential to copy and, alas, a lot of copying did happen. People even put the protocols on the web. That's why the prof might have some incorrect suspicion. I have also seen similar checks to do loads of false positives including marking of the obligatory legal declaration in the theses. – Vladimir F Героям слава Nov 01 '19 at 22:23
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You don't have the option of resubmitting the reports -- and haven't since the day you handed in the reports. If a hearing process has been started, it will be finished.

68% similarity is a high number, and unlikely to happen by pure coincidence. I suggest you examine your process of writing your lab reports with a fine tooth comb, and be ready to convey this process to the hearing board.

In preparation for the hearing, you should ask for the document which you are accused of copying in order for you to prepare. As I said, 68% is a high number, but there could be explanations. For example, if both papers cite the same sources, then the citations in the bibliography could boost the similarity percentage, and the prof did not examine the similarities carefully enough to see this issue.

Another possibility is that you didn't copy the older lab report, but that both you and the student who wrote the old report used the same sources for their preparation, and there was insufficient citation of the sources you used. In this case, both you and the student you're accused of copying from plagiarized from the same source, and the hearing board will likely still find you responsible for a violation of an honesty policy.

If this is the case, and you insufficiently cited the same sources that the other student used, I'd encourage you to have the information in-pocket for your hearing. There is subtle difference between finding an old lab report and copying it, or boosting text from a wikipedia listing without citing it, because you don't understand how to do it correctly. Both are violations, but convey different intention and might differ in terms of severity.

You may also be faced with whether the two reports are treated as TWO violations or pooled together as one violation. If the case is improper citation, and not copying from an old report, you might ask for some mitigation of penalty for the second offense, as it would have been dandy if the prof could have identified your issue before you repeated it.

Go into the hearing realizing that the committee isn't out to get you, but to correct you and make sure you learn the right way of doing things.

Good Luck with your hearing.

Scott Seidman
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  • "In preparation for the hearing, you should ask for the document which you are accused of copying in order for you to prepare." That is unlikely to be shared with the OP. At my university we cannot and will not share another student's work. At most, the OP may be shown excerpts of the previous text. Maybe. – GrotesqueSI Nov 01 '19 at 14:58
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    @GrotesqueSI your student's union needs to be doing a better job then, IMO. Trying to punish a student on the basis on secret evidence would have caused a fit, where I went to school. – mbrig Nov 01 '19 at 15:50
  • Let us continue this discussion about theory of law and the GDRP in chat. – cag51 Nov 04 '19 at 15:47
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I am a professor. Even if you don't have any "hard" evidence that you wrote it yourself, one thing that would be convincing to me, if I was on this committee, was that you knew the material you handed in. E.g. you could take an oral exam on the material. So, make sure you really know what you handed in and why you wrote it the way you did.

And as written on another answer, try to stay calm. Have some faith that the committee will find the truth.

jerlich
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In addition to other excellent answers, I suggest you use make the following argument:

Rare events are likely in large populations

... to explain why it is reasonable for your version of events to have occurred.

The panel would be thinking: "It's extremely unlikely for independently-written reports to have such a high degree of similarity - @Ballislyf must be lying to us."

And you tell them: Yes, it's extremely likely if you're looking at just two report-writers. But in both this and the previous semester we had at least n students taking this lab; so actually, we have n * n pairs of students. And whenever some pairs of students all have non-similar reports, that only increases the probability of the remaining pairs to produce similar reports. Thus the probability of finding at least one pair of students with similar reports is in fact much much higher.

If you know a bit of math - and you probably do - you can work out an upper bound of this probability and present it.

Something to consider: The analogy of winning the lottery, or being struck by lightning. If a student misses a deadline saying they were struck by lightning and their laptop died, you would probably think they're just lying. But - some people do get struck by lightning; and some of them are students; and they often have homework on their computers. So - this must happen sometimes.

There are few problems with this argument:

  • Students aren't randomly-sampled from anywhere, nor are their reports uniform samples from the space of possible reports.
  • You don't know how slim the "faux-probability" of similar reports is.
  • To have two separate lab reports be similar between the same students is less probable than just one, and seems more damning. That might need extra explanation.
einpoklum
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    And, again, see "birthday paradox": the probability of two things being the same in a population tends to only need square-root-of-N population, rather than N or N/2, where there are N possibilities. – paul garrett Nov 02 '19 at 18:45
  • @paulgarrett: Well, it's not exactly like the birthday paradox since you take one person from each group. I could have said "two-sided birthday paradox" but that seems a bit too much... – einpoklum Nov 02 '19 at 19:28
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    As a professor, I don't think it should be the student's place to make these kinds of arguments. It is the job of the committee to understand the strengths and weaknesses of turnitin and to evaluate the reports and the documents which are supposedly 68% similar. – jerlich Nov 03 '19 at 05:05
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    @jerlich: While the committee should realize this, it doesn't mean that it will. – einpoklum Nov 03 '19 at 08:44
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    And combine that with the fact that in a few areas there are only a few ways in which something can be correctly expressed. If you ask 1000 mathematicians to independently define the derivative, you will get approximately one answer. (excluding "I forget", perhaps) – Buffy Nov 03 '19 at 13:33
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From turnitin.psu.edu:

False Positives

A false positive, that is a paper with a high similarity score that is not the result of a student committing plagiarism, can occur for the following reasons.

If a rough draft is stored in the Turnitin repository, you may get a false positive for a final draft.

If a student submits a paper to Turnitin.com independently of the course to check for plagiarism, the version uploaded for the course will be a “copy.”

It is possible your student is being plagiarized. The Originality Report identifies matches, but does not necessarily identify which is the “copy” and which is the “original.”

A student could be expanding previous research for a new assignment, but copying text from the original research.

Does any of this apply to you? If so, you can use this as your defense during the hearing.

Evorlor
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    This is actually a denial by Turn-it-in of having any actual false positives... – einpoklum Nov 03 '19 at 08:45
  • @einpoklum-reinstateMonica: ... which they like any system (or human) will inevitably have in reality. (And seeing that they basically deny this doesn't improve my trust in that claim) – cbeleites unhappy with SX Nov 03 '19 at 21:03
  • The second item on the list (rough drafts) shouldn't occur if the system is set up properly - but does. The third is a bigger issue as the student submitting independently shows up as a different user. The final is often accounted for in the submission instructions, and there are workarounds for that (I think it may involve not checking against work submitted by the same student, but I don't configure the system) – Chris H Nov 04 '19 at 10:13
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Here's a little more detail on Turnitin's process. It's a little too much for a comment, and offers some hints as to what's going on.

Turnitin (produces a "similarity score" using a black-box algorithm, but the marker can see duplicated passages, and in many cases their sources*. In the reports I marks, a similarity score of around 20% is common for reports on projects that run every year - titles, references, standard terminology, etc. Over about 35% generally seems to indicate some use of choice phrases from the literature, often combined with a limited vocabulary that ends up repeatedly using the same wording. To reach 68% would require many sentences in which only a few words are changed from the sources.

If the score is 68% I'd expect the marker to do some digging into what the "copied" passages match. If you match an earlier interim report of your own - no problem. Here we have guidance and systems to take care of that. But that should be commonplace, so I doubt it's what's going on here. The software is only a tool, and one that has to be used carefully; so far I see no evidence from what they've said that the necessary checks have been carried out, but that's something that should come out in the investigation.


*Published sources and sources within the same institution are identifiable; coursework from other institutions is only identified by institution name (and perhaps year).

Chris H
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The other answers seem to have summed up the main part. I'd only add that, depending on where you are, threatening a lawsuit might actually be a good course of action as well. Where I'm from (in Eastern Europe) many professors would probably drop the whole thing if you get them to believe you will actually sue the university as it's not worth the trouble and risk to them. In the US trials seem to be a somewhat trivial matter but where I'm from the professor could get fired if you do in fact win the trial. Going through the trouble of getting a lawyer involved also seems to make people think you actually believe that you're right.

Do keep in mind it could backfire as if he does decide to pursue he will do his absolute best to prove you cheated and you will have lost time that could have been spent preparing evidence in your favor. Think of it as a last resort. In case you go that route, even if bluffing, make sure you document as much as possible just in case you do decide to sue.

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    this is poor advice. he hasn't been found guilty of anything yet. – jerlich Nov 03 '19 at 04:55
  • @jerlich It's not really about the trial itself but the threat/pressure of one. Pretty much a last resort bluff. The part about documentation is in case the threat makes the professor emotionally invested enough to do something unprofessional enough to provide legal leverage. – Lanolderen Nov 03 '19 at 11:33
  • You are implying that a lawsuit would be a good action even if they were actually guilty. – DJClayworth Nov 04 '19 at 14:09