Fitting Distribution to set of data

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NeGM
NeGM 2021-1-31
编辑： Image Analyst 2021-1-31
Hi everyone,
I have a vector A represented by the histrogram attached in the image. I'd like to fit a normal, Gaussian, and Poisson distribution to see which one fits best. Is there a function in MATLAB that would allow me to do that? Thank you

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Image Analyst
Image Analyst 2021-1-31
编辑：Image Analyst 2021-1-31
In my opinion, you should not fit either of those two. Because your distribution is not symmetrical you will have trouble fitting a Gaussian. I've had trouble before (MATLAB threw warnings) while trying to fit a Gaussian that was basically just the side slope of a Gaussian hump like you have. Likewise a Poisson expects in most cases a peak with lower values at the origin. I think a better equation to describe your equation would be an exponential decay, and I'm attaching a variety of demos for you.

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Bjorn Gustavsson
Bjorn Gustavsson 2021-1-31
If you have the statistics toolbox you have the function fitdist, that should do the job. Just check the help and documentation to that function.
HTH

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