popnstddev

Return population variance

Declaration

Source position: line 0

function popnstddev(

const data: array of Extended

):float; function popnstddev(

const data: PExtended;

const N: Integer

):float;

Description

Popnstddev returns the square root of the population variance of the values in the Data array. It returns zero if there is only one value.

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

Errors

None.

Example

Program Example35;

{ Program to demonstrate the PopnStdDev function. }

Uses Math;

Type
  TExArray = Array[1..100] of Float;

Var
  I : Integer;
  ExArray : TExArray;

begin
  Randomize;
  for I:=low(ExArray) to high(ExArray) do
    ExArray[i]:=(Random-Random)*100;
  Writeln('Max              : ',MaxValue(ExArray):8:4);
  Writeln('Min              : ',MinValue(ExArray):8:4);
  Writeln('Pop. stddev.     : ',PopnStdDev(ExArray):8:4);
  Writeln('Pop. stddev. (b) : ',PopnStdDev(@ExArray[1],100):8:4);
end.

Notes

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