Overview

Returns the inverse of the F cumulative distribution.

Applying the Formula

All statistical formulas are calculated using the Statistics class, and the following table describes how to use its  InverseFDistribution method.

Statistical Interpretation

Suppose  and  are the observed variances for two samples, of sizes n and m, drawn from normal populations with variances  and  , respectively. We can test the null hypothesis that  by calculating the distribution of the variance ratio.

Figure 1: F Distribution.

Example

The following sample calculates the F value for the given F distribution probability.

Visual Basic	Copy Code
Imports Dundas.Charting.WebControl ... ' Calculate the F value. Dim result As Double = Chart1.DataManipulator.Statistics.InverseFDistribution(.05, 15, 30)

C#	Copy Code
using Dundas.Charting.WebControl; ... // Calculate the F value. double result = Chart1.DataManipulator.Statistics.InverseFDistribution(.05, 15, 30);

See Also