static double[] Rank(IEnumerable <double> series)
{
if (series == null)
{
return(new double[0]);
}
// WARNING: do not try to cast series to an array and use it directly,
// as we need to sort it (inplace operation)
var data = series.ToArray();
return(ArrayStatistics.RanksInplace(data, RankDefinition.Average));
}
/// <summary>
/// Evaluates the rank of each entry of the provided samples.
/// The rank definition can be specificed to be compatible
/// with an existing system.
/// </summary>
/// <param name="data">The data sample sequence.</param>
/// <param name="definition">Rank definition, to choose how ties should be handled and what product/definition it should be consistent with</param>
public static double[] Ranks(this IEnumerable <double> data, RankDefinition definition = RankDefinition.Default)
{
var array = data.ToArray();
return(ArrayStatistics.RanksInplace(array, definition));
}
