IStatistics.LogInv

Syntax

LogInv(Probability: Double, Mean: Double; StandartDeviation: Double): Double;

Parameters

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

Mean. Mean ln(x).

StandartDeviation. Standard deviation ln(x). Value must satisfy the following constraint: StandartDeviation > 0.

Description

The LogInv method returns the inverse function of a lognormal distribution.

Comments

If Probability = LogNormDist(x; …), then LogInv(Probability ; …) = x.

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.LogInv(0.039084,3.5,1.2);
    If st.Status <> 0 Then
        Debug.WriteLine(st.Errors);
    Else
        Debug.WriteLine("Inverse function: " + d0.ToString);
    End If;
End Sub UserProc;

After executing the example the console window displays the value of the inverse function of logarithmic normal distribution:

Unit execution started

Inverse function: 4.00002521867993

Unit execution finished