Astronomy Stack Exchange
Astronomy Stack Exchange

Questions tagged [data-analysis]

Analysis of data is a process of inspecting, cleaning, transforming, and modeling data with the goal of discovering useful information, suggesting conclusions, and supporting decision making.

Analysis of data is a process of inspecting, cleaning, transforming, and modeling data with the goal of discovering useful information, suggesting conclusions, and supporting decision making.

Data analysis has multiple facets and approaches, encompassing diverse techniques under a variety of names, in different business, science, and social science domains. In astronomy, data in the form of images, calculations and all kind of waves is abundant, it's analysis is a priority for the study of space.

296 questions
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How do you propagate asymmetric errors? (on the practical way to...)

I've used uncertainties's ufloatpackage to propagate uncertainties as I thought it's the standard way to do it. Now I want to propagate errors when I have different lower and upper uncertainties. From this source I understand that there’s the…
nuwe
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Are astronomical studies with no "proprietary period" for data organized differently than studies with "proprietary period"?"

Let's assume you are a group of astronomers that proposed an observation by a telescope. The observation has been conducted, so you have got the data you wanted. But the data has no proprietary period. So everybody can access it by the internet. If…
Heopps
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Will there be public access to the New Horizons data from Ultima Thule?

I imagine New Horizons data from its encounter with Ultima Thule (2014 MU69) has started arriving. Does anyone know if this data is public? And, if so, how you can access it?
Snowcrash
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Procedures to test an hypothesis

In the context of planet formation and with the intention of testing different migration and in situ formation scenarios, I'm wondering what are the standard procedures to test and rank different hypotheses given known properties of the disk: e.g.,…
nuwe
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How to get phase-folded data (-0.5,0.5)?

How to get phase-folded data (-0.5,0.5)? For phase-folded value to the interval (0,1), I use: $$ \phi = \frac{H_{JD}-T_0}{P} \mod 1$$ $\phi$ is phase HJD is time T0 is the reference time P is the period T0 should correspond to $\phi$ = 0
Carly
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How to plot 68% contours?

I am doing a grid search of omega_Matter vs Omega_dark_energy by iterating over ranges of both and determining the chi-squared to determine the optimal value of both for a LambdaCDM model. I have my grid of omegaM and OmegaDE but I am trying to plot…
r21
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What is z in this program?

Does z stad for the mass fraction of all the remaining chemical elements except helium and hydrogen, please? Source: https://github.com/chrysante87/pyterpol/wiki
Anna-Kat
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Solving the inverse problem - inspection

After solving the inverse problem*, how to investigate whether the solution is unique or not? When I check theoretical values and published values during the convergence and search for the lowest value for chi-squared, is it sufficient? *The task…
Anna-Kat
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How to determine period of pulsar?

I've got a file which contains data about photons coming from some pulsar. For each photon I know: a) time, when it was registered, b) a probability that this photon came from pulsar but not from galactic background, c) energy of a photon. My task…
user43283
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Any freely available large stellar spectra catalog?

For a non-astronomy personal project I would like to have a large set of optical stellar spectra combined with absolute magnitude when available. I search for a dataset that contains 10k - 10M objects, with total compressed size below 100Gb (ideally…
permeakra
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Do integer multiples occur in astronomy data?

I'm a statistics student, currently working on "quantum inference", which is the statistical problem of inference in the quantum model: $y_i = \alpha + \beta x_i + \epsilon_i$ which is similar to a simple linear model, except instead of $x_i$ being…
user54038
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What must/do astronomers reveal beyond their academic papers?

Academic papers often make claims about observational data and results from computations. The papers only refer to names of data sources (such as an observatory) and of mathematical methods without any specifics, other than some of it illustrated in…
LocalFluff
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Detector Pixel Geometry?

When analyzing an image I'm used to thinking of the pixels as a grid of boxes the photons have fallen into. I assume that there's zero space between the boxes. That seems obviously wrong, since there needs to be some separation on the detector to…
Sean Lake
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Database for distant stars

I'm looking for a database of stars that lists as many of the known stars as possible. Ideally, I'd like it to have information on the radius of the stars, the distance from the earth and the classification. What source(s) exist for this data…
EmeraldThunder-
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How to search binaries in Simbad using spectral types

In the Simbad database there are many binary stars listed with the spectral classification of each component. For example, for $\alpha$ Centauri, Simbad yields a spectral type of G2V+K1V. My question is, what criterias do I have to input to search…
Swike
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