python equivalent of qnorm, qf and qchi2 of R
You may find probability distributions in scipy.stats. Every distribution defines a set of functions, for example if you go to norm distribution and scroll down the page you may find the methods which include
ppf(q, loc=0, scale=1) # Percent point function (inverse of cdf — percentiles)that is what scipy calls Percent point function and does what R q functions do.
For example:
>>> from scipy.stats import norm>>> norm.ppf(.5) # half of the mass is before zero0.0Same interface for other distributions, say chi^2:
>>> from scipy.stats import chi2>>> chi2.ppf(.8, df=2) # two degress of freedom3.2188758248682015