MeanT Routine

Summary

Trimmed mean.

Declaration

Function MeanT(Data: TVec; alpha: TSample = 0.05): TSample;

Parameter	Description
Data	Data. An exception is raised if Data vector is complex.
Alpha	Defines the percent of value excluded from mean calculation. If alpha parameter is omitted, the default value 0.05 is used (meaning highest 2.5% and lowest 2.5% of data will be excluded). Alpha paramater must lie on the interval [0,1) otherwise an exception is raised.

Result

the mean of all Data vector elements, excluding highest and lowest 100*alpha/2 percents of value.

See Also
MeanH
MeanG

Example 1

Calculate mean for given values, excluding top and bottom 7.5% i.e 15%.

  Uses MtxExpr, Statistics, Math387;
  procedure Example;
  var a: Vector;
    MT : TSample;
  begin
    a.SetIt(false,[1, 2, 97, 98, 99, 100, 190]);
    MT := MeanT(a,0.15); // MT = 79.2
  end;

  #include "MtxVecCpp.h"
  #include "Statistics.hpp"
  void __fastcall Example();
  {
    Vector a;
    a->SetIt(false, OPENARRAY(double,(2,3,5,4)));
    double MT = MeanT(a);
    // MT = 79.2
  }

  using Dew.Math;
  using Dew.Stats;
  using Dew.Stats.Units;
  namespace Dew.Examples
  {
    private void Example()
    {
      Vector a = new Vector(0),
      a.SetIt(false, new double[] {1, 2, 97, 98, 99, 100, 190});
      double MT = Statistics.MeanT(a);
      // MT = 79.2
    }
  }