4.1.3.2.14 VarianceOfTotal

VarianceOfTotal function

Prototype:	function VarianceOfTotal (const VarianceOfMean_ :extended; const Npopulation_ :extended) :extended;
Description:	Calculates variance of total
Syntax:	variable := VarianceOfTotal (VarianceOfMean, Npopulation);
	Part	Description
	variable	A variable declared as type of extended
	VarianceOfMean	Variance of mean
	NPopulation	Number of observations in a population

Return value:	Variance of total

Example

var
  tab : TTableWrapper;
  attributeName: string;
  nullAsZero: boolean;
  v, vt, c: extended;

begin
  tab:= Trees.table;
  attributeName:= 'DBH_mm';
  nullAsZero:= false;                  

  v:= VarianceOfMean(tab, attributeName, nullAsZero, Trees.RecordCount, 20);

  vt:= VarianceOfTotal(v, 4);

  c:= ConfidenceIntervalOfTotal(Trees.RecordCount, vt, 5);

  ShowMessage(FloatToStr(c));
end.