Method pop_stdev

libraries/Statistic/Statistic.h:208–212

Population standard deviation

  // Population standard deviation
  value_type pop_stdev() const {
    if (!_useStdDev) return NaN;
    if (_cnt == 0) return NaN; // prevent DIV0 error
    return std::sqrt( _extra.ssqdif() / _cnt);
  }


  value_type unbiased_stdev() const {