DOC: wrong bound for sigma in docstring of Beta

[Gattocrucco]

The docstring of Beta says

sigma : tensor_like of float, optional
    Alternative standard deviation (1 < ``sigma`` < sqrt(``mu`` * (1 - ``mu``))).

while it should be 0 < sigma < ....

(Related issue: #5023 says that sigma may be dropped in favor of nu)

Versions and main components

• PyMC/PyMC3 Version: 4.3.0
• Aesara/Theano Version: 2.8.7
• Python Version: 3.10.5
• Operating system: macos 12.6.1 arm
• How did you install PyMC/PyMC3: pip

[ricardoV94]

Seems to have been changed (accidentally?) in #5500

@Gattocrucco Do you want to add a PR to fix it?

About #5023 we would probably add it as an alternative parametrization, instead of deprecating sigma completely because many users probably rely on it. Feel free to take on that PR as well if you are interested :)

[alekracicot]

Is anyone working on this? If not I can do it.

[ricardoV94]

Is anyone working on this? If not I can do it.

Go ahead