Question about the accuracy of the Gaussian Fit

Hi all,
I was having some doubts on the accuracy of the gaussian fit performed by LabVIEW and implemented the code in attachment to test it.
I made a distribution and made a Gaussian fit to it and extracted the average and standard deviation.
Then, I used the same distribution and padded it with zeros to the left and right and did a gaussian fit to the overall distribution.
I was expecting the average to change but the standard deviation to be the same, since the difference in the distribution are the zeros...
The thing is that neither the average (the average is a fractional value) nor the standard deviation are the expected.
Any hints on why this may be happening?
Thank you very much in advance!
Best regards.
Attachments:
gauss_fit_test.zip ‏17 KB

Your data is NOT a Gaussian and fitting it to a Gaussian is thus completely meaningless. As Lynn said, the lower graph adds a sigificant amount of zeros to the dataset and thus will bias the fit.
You can do a "not_equal_zero...boolean_to_0,1" on the y data and wire it to the weight to disregard all zero values. Now you get the same result.
You should actually change the parameter bounds to allow for a fit of the offset, and you'll see that the upper graph will have a lower offset (offset=-3.6) compared to the lower graph (offset=-0.5). Since you are forcing the offset to be zero, the fit will compensate by changing the width.
What are you actually trying to achieve with this exercise? If this simulation is similar to your real data, maybe you should fit it to a triangle function instead. If you just want to calculate the mean and standard deviation of the data, use the classic statistics tools. Does this represent a histogram of some data?
LabVIEW Champion . Do more with less code and in less time .

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