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# 20. Statistics

This chapter describes the statistical functions in the library. The basic statistical functions include routines to compute the mean, variance and standard deviation. More advanced functions allow you to calculate absolute deviations, skewness, and kurtosis as well as the median and arbitrary percentiles. The algorithms use recurrence relations to compute average quantities in a stable way, without large intermediate values that might overflow.

The functions are available in versions for datasets in the standard
floating-point and integer types. The versions for double precision
floating-point data have the prefix `gsl_stats`

and are declared in
the header file ‘`gsl_statistics_double.h`’. The versions for integer
data have the prefix `gsl_stats_int`

and are declared in the header
file ‘`gsl_statistics_int.h`’.