# PyQRS

**(Probabilities, Quantiles and Random Samples)**

For any given probability distribution, PyQRS lets you:

- calculate probabilities,

- calculate quantiles (inverse probabilities),

- draw random samples,

- calculate a missing (non-integer) parameter value.

Included are:

- 10 discrete distributions, including the null distributions of the Wilcoxon/Mann-Whitney test statistics,
- 22 continuous distributions, including the central and non-central t-, chi-square- and F-distributions.

PyQRS was developed as a tool for students studying statistics. It is meant to replace traditional probability tables and at the same time it should enhance the studentsâ€™ understanding of probability concepts. Therefore a graphical user interface was designed which shows all values in their natural position with respect to the probability (density/mass) function and with respect to the cumulative distribution function.

The source code as well as executable binaries for the Android, Linux and Windows platforms are available.