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Statistics.InterQuartile Function
Statistics | Functions | Example | See Also

InterQuartile range.

Pascal
function InterQuartile(const X: TVec; Method: TPercentileMethod = pctMethodNPlus): double;
File
Parameters
Parameters 
Description 
X 
Data. An exception is raised if X is complex. 
Method 
Defines one of the available methods for calculating percentile. Software packages use different methods to calculate percentiles. For example, Excel uses pctMethodNMinus, while on the other hand, NCSS's default method is pctMethodNPlus. 
Returns

the interquartile range of all X vector elements. The interquartile range is defined as a difference between 75th percentile and 25th percentile of given values.

See Also
Example

Calculate the IQR for given values. 

Uses MtxExpr, Statistics, Math387;
function Example: double;
var a: Vector;
    Res: double;
begin
    a.Size(4);
    a.SetIt([2,0.1,3,4]);
    Result := InterQuartile(a, TPercentileMethod.pctMethodNMinus); // Res = 1.725  //Excel convention
end;
end;
#include "MtxExpr.hpp"
#include "Statistics.hpp"
#include "Math387.hpp"
void __fastcall Example()
{
    sVector a;
    a.SetIt(false, OPENARRAY(double,(2,0.1,3,4)));
    double res = InterQuartile(a,pctMethodNMinus); // Res = 1.725  //Excel convention
}
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