CHIWEI: A code of goodness of fit tests for weighted and unweighted histograms in Fortran-77, C++, R and Python

Improved a program for goodness of fit tests for histograms with weighted entries as well as with unweighted entries which is presented in Fortran-77, C++, Python and R. The code calculates test statistics for histograms with either normalized or unnormalized weights of events. The previous version of this program (AEKQ_v1_0) may be found at http://dx.doi.org/10.1016/j.cpc.2011.10.009.