# Questions tagged [data-analysis]

Use for question relating the the techniques of data analysis.

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### JLA SNDATA working [closed]

Does anyone know how to use Joint Light Curve Analysis (JLA) SNData module (including the download)? I tried to look at the documentation http://supernovae.in2p3.fr/sdss_snls_jla/ReadMe.html#sec-2 ...
41 views

### Error calculation for a relative difference with only one standard deviation (STD)

I have a quantity that is calculated with two measurements, but I only have a tabulated standard deviation for one of the measurements. How would I calculate the error on the calculated quantity? The ...
65 views

### Ambiguous propagation of uncertainty

Suppose I have a voltage versus current graph with various "peaks" in current at given voltages. For example, this is what is seen in a Franck Hertz experiment. I can measure the value of ...
33 views

### Where does the error from Origins fitting come from?

Im using Originpro to do some linear fitting of my data points. Origin calculates the gradient and gives an error. Where does this error come from? Ive assumed its how much the data points are ...
1 vote
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1 vote
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### Struggling to find an approximation for these experimental values

I'm looking for the formula that best approximates these experimental x-y values: A correct answer should present asymptotic behavior on both the X and Y axes. Y should approach infinity as X ...
1k views

### Why don't we use absolute error while calculating the product of two uncertain quantities?

I've found a rule that says, "When two quantities are multiplied, the error in the result is the sum of the relative error in the multipliers." Here, why can't we use absolute error? And why ...
1 vote
60 views

### Statistics for analysis in Physics

While I am well aware of the branch of physics called statistical physics my question does not pertain to this. My background is bioinformatics which very rarely uses causal modelling instead we tend ...
59 views

### How is number of photons found on a spectra?

Sorry for the stupid question, but I am very new to this and have no background in physics. Say we have a spectra as the one in the image, which represent a charge distribution over a specific channel,...
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### Needed precision for detecting effects in experiments

I did a bayesian fit to experimental data with a physical model. I notice that some effects cannot be detected due to the precision of the data and the physical model doesn't fit in the best way. So I ...