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-rw-r--r--statistics/chisq.hpp2
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diff --git a/statistics/chisq.hpp b/statistics/chisq.hpp
index c460394..8a3881a 100644
--- a/statistics/chisq.hpp
+++ b/statistics/chisq.hpp
@@ -1,5 +1,7 @@
/**
\file chisq.hpp
+ \brief chi-square statistic
+ \author Junhua Gu
*/
#ifndef CHI_SQ_HPP