IStatistics.NormInv

Syntax

NormInv(Probability: Double; Mean: Double; StandartDeviation: Double): Double;

Parameters

Probability. Probability that corresponds to normal distribution. Available values are taken from the range [0, 1]

Mean. Arithmetic mean of the distribution.

StandartDeviation. Standard deviation of the distribution. Value must satisfy the following constraint: StandartDeviation > 0.

Description

The NormInv method returns the inverse normal distribution.

Comments

If Mean = 0 and StandartDeviation = 1, the method uses standard normal distribution (NormDist).

Example

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

Sub UserProc;
Var
    st: Statistics;
    d0: Double;
Begin
    st := New Statistics.Create;
    d0 := st.NormInv(0.99984,3,2.5);
    If st.Status <> 0 Then
        Debug.WriteLine(st.Errors);
    Else
        Debug.WriteLine("Inverse normal distribution: " + d0.ToString);
    End If;
End Sub UserProc;

Executing the example shows inverse normal distribution in the console window:

Unit execution started

Inverse normal distribution: 11.9963675517908

Unit execution finished