bug in covariance_source.cpp??

[Brian Gough]

Juan Jose Gomez Cadenas writes:
 > In covariance_source.cpp, the function gsl_stats_covariance
 > calls the function covariance_m but I believe it should
 > call the function covariance


The _m function takes a precomputed mean, rather than a "known
mean" (in the statistical sense), so I believe the factor of
1/(n-1) is ok and should be the same for both cases.  Maybe
this should be clarified in the documentation though.

-- 
Brian