Questions tagged [astronomy]

Astronomy (from Greek: ἀστρονομία) is a natural science that studies celestial objects and phenomena. It applies statistics and other mathematics, physics, and chemistry in an effort to explain the origin of those objects and phenomena and their evolution.

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How to include image errors in convolutional neural network?

I'm using convolutional neural networks in order to classify astronomical sources directly from the images. For each image I've a weight map, i.e. an image with the same shape, whose pixels are ...
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127 views

Should I use a paired sample t-test to compare two methods of measuring absorption lines?

Background I'm doing a research project in astronomy and measuring equivalent widths of absorption lines using Gaussian fits from a star's spectrum in order to determine the star's chemical ...
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The probability of photon collision

I was reading a textbook and I couldn't figure out something that seemed really obvious: Assume that the space is uniformly and randomly filled with stars, and the mean radial distance between the ...
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50 views

Modeling observed data using simulated datasets of different quality [closed]

I have a sample {y} (~50k points) of observed astronomical data in multiple dimensions (~15), around 4 of which I am interested in. The process which produces the data is very complicated and only ...
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441 views

Advice to find faint periodic signals in time series data using deep learning methods

We are using few petabytes worth of time series astronomy data. The general aim is to find very faint periodic signals within it. Our current method of processing this data is to do a Fast Fourier ...
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240 views

Machine Learning for optimization of configuration file

For my master's thesis I am using a 3rd party program (SExtractor) in addition to a python pipeline to work with astronomical image data. SExtractor takes a configuration file with numerous parameters ...
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199 views

Learn Bayesian inference applied to astronomy / astrophysics?

I'm looking for resources (books, articles, sites, etc.) to learn about Bayesian inference, but specifically applied to astronomy and astrophysics.
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24 views

What is the point of using an initial estimate when sigma-clipping data?

I am reading a paper that is discussing sigma clipping some velocity data, lets call it a set $V$, and it says: The center at each iteration of the $3\sigma$ clipping is the biweight average, and $\...
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196 views

Statistics behind gravitational waves discovery [closed]

The recent gravitational waves result is a stunning feat for both physics and engineering. I suspect there may be much to admire on the statistics side as well. For example, the original paper states: ...
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184 views

How to check if two results are consistent

I'm looking at an astronomical object. In one observation, it does something (not relevant what :) 2199 times out of a possible 2936. In another (later) observation, it occurred 2094 times out of a ...
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1answer
992 views

Method for fitting censored data in R

I have 320 data points - each has a redshift and a turnover-frequency, and I want to fit a correlation between them (a linear fit). However, 120 of the turnover-frequency values are upper limits. As ...
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1answer
657 views

Python Astronomy Censored Data in Lifelines [duplicate]

I am trying to find a correlation between a given data set containing redshifts and turnover frequencies (I have a list of 320 galaxies, and the redshift and turnover frequency (a turnover frequency ...
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1answer
136 views

Why are there more bayesians than frequentists in astrophysics?

I heard somewhere that in astrophysics, there are more bayesians than frequentists (although in general, I think that bayesian community is smaller). Is there something special about "astro" data what ...
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History: the role of statistics in astronomy

I recently boldly claimed in front of a group of fairly smart eighth grade students that astronomy contributed greatly to the foundations of statistics and many statistical concepts were invented for ...