stddev

Return standard deviation of data

Declaration

Source position: line 0

function stddev(

const data: array of Extended

):float; function stddev(

const data: PExtended;

const N: Integer

):float;

Description

Stddev returns the standard deviation of the values in Data. It returns zero if there is only one value.

The second form of the function accepts a pointer to an array of N values.

Errors

None.

Example

Program Example40;

{ Program to demonstrate the stddev function. }

Uses Math;

Var
  I : Integer;
  ExArray : Array[1..10000] of Float;

begin
  Randomize;
  for I:=low(ExArray) to high(ExArray) do
    ExArray[i]:=Randg(1,0.2);
  Writeln('StdDev     : ',StdDev(ExArray):8:4);
  Writeln('StdDev (b) : ',StdDev(@ExArray[0],10000):8:4);
end.

Notes

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