/// <summary> /// Evaluates the population standard deviation from the provided full population. /// On a dataset of size N will use an N normalizer and would thus be biased if applied to a subset. /// Returns NaN if data is empty or if any entry is NaN. /// </summary> /// <param name="population">The full population data.</param> public static double PopulationStandardDeviation(this IEnumerable <double> population) { var array = population as double[]; return(array != null ? ArrayStatistics.PopulationStandardDeviation(array) : StreamingStatistics.PopulationStandardDeviation(population)); }