IStatistics.ZTest

Syntax

ZTest(Data: Array; Value: Double; Sigma: Double): Double;

Parameters

Data. Array of data to which the Value is compared.

Value. Checked value;

Sigma. Known standard deviation of the general population.

Description

The ZTest method returns the bilateral P-value of the z-test.

Comments

A z-test is used to calculate a standard estimate for Value based on a data array and to return two-sided probability for normal distribution. This function can be used to estimate probability than a specific observation is taken from a specific general population.

Example

To execute the example, add a link to the Stat system assembly.

Sub UserProc;
Var
    st: Statistics;
    d0: Double;
    y: Array Of Double;
Begin
    y := New Double[10];
    y[00] := 6;
    y[01] := 17;
    y[02] := 9;
    y[03] := 15;
    y[04] := 21;
    y[05] := 24;
    y[06] := 20;
    y[07] := 21;
    y[08] := 14;
    y[09] := 25;
    st := New Statistics.Create;
    d0 := st.ZTest(y,15,4);
    Debug.WriteLine("Z test: " + d0.ToString);
End Sub UserProc;

Executing the example shows the P-value of the z-test in the console window:

Unit execution started

Z test: 0.0409951605002064

Unit execution finished