templat<typename T, typename I = unsigned long, typename = typename std::enable_if<std::is_arithmetic<T>::value, T>::type>
struct SEMVisitor;
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This functor class calculates the Standard Error of the Mean for a given column.
explicit SEMVisitor (bool bias = true);
See this document and dataframe_tester.cc for examples.
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T: Column data type.
I: Index type.
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