4 #ifndef SEQUENCE_SUMMSTATS_THETAPI_HPP__     5 #define SEQUENCE_SUMMSTATS_THETAPI_HPP__     7 #include <Sequence/AlleleCountMatrix.hpp>    23     double thetapi(
const AlleleCountMatrix& ac);
 The namespace in which this library resides. 
double thetapi(const AlleleCountMatrix &ac)
Mean pairwise differences.