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 How to get the probability density function of my data set

This is my first post here so please be kind to me Smile

I have a data set that is a time-series of stock returns. I am able to plot the probability density function (PDF) using a library such as Matplotlib, however what I really want is the underlying function/formula.

Is this possible to get somehow? Surely the plot has used some kind of formula and I just want to see what that formula looks like.

Best regards,
the source code is available here:
the documentation is very good and may answer your question

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