IStatistics.Correl

Syntax

Correl(A1: Array; A2: Array): Double;

Parameters

A1. First data series.

A2. Second data series.

Description

The Correl method returns correlation coefficient between two series.

Comments

Correlation coefficient is used to determine if there is a relationship between two properties.

For correct calculation the A1 and A2 series:

Should have equal number of points.
Should be non-constant.

Example

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

Sub UserProc;
Var
    st: Statistics;
    d0: Double;
    y, x: Array Of Double;
Begin
    y := New Double[10];
    y[00] := 1.6; y[05] := 2.1;
    y[01] := 1.7; y[06] := 2.2;
    y[02] := 1.8; y[07] := 2.3;
    y[03] := 1.9; y[08] := 2.4;
    y[04] := 2; y[09] := 2.8;
    x := New Double[10];
    x[00] := 2; x[05] := 6;
    x[01] := 4; x[06] := 15;
    x[02] := 2; x[07] := 17;
    x[03] := 5; x[08] := 14;
    x[04] := 12; x[09] := 3;
    st := New Statistics.Create;
    d0 := st.Correl(y, x);
    Debug.WriteLine("Correlation coefficient: " + d0.ToString);
End Sub UserProc;

After executing the example the console window displays correlation coefficient value.