templat<typename T, typename I = unsigned long, typename = typename std::enable_if<std::is_arithmetic<T>::value, T>::type>
struct StatsVisitor;
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This functor class calculates the following statistics of a given column; mean, variance, standard deviation, skew, and kurtosis. See this document and dataframe_tester.cc for examples.
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T: Column data type.
I: Index type.
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