Enterprise Edition Only Feature. This method returns the inverse of the F cumulative distribution.

Returns the inverse of the F probability distribution. If p = FDIST(x,...), then FINV(p,...) = x. The F distribution can be used in an F-test that compares the degree of variability in two data sets. For example, you can analyze income distributions in the United States and Canada to determine whether the two countries have a similar degree of diversity.

Syntax

Visual Basic (Declaration)
Public Function InverseFDistribution( _ ByVal probability As Double, _ ByVal firstDegreeOfFreedom As Integer, _ ByVal secondDegreeOfFreedom As Integer _ ) As Double

Visual Basic (Usage) Copy Code

Visual Basic (Usage)	Copy Code
`Dim instance As Statistics Dim probability As Double Dim firstDegreeOfFreedom As Integer Dim secondDegreeOfFreedom As Integer Dim value As Double value = instance.InverseFDistribution(probability, firstDegreeOfFreedom, secondDegreeOfFreedom)`

Dim instance As Statistics
Dim probability As Double
Dim firstDegreeOfFreedom As Integer
Dim secondDegreeOfFreedom As Integer
Dim value As Double
 
value = instance.InverseFDistribution(probability, firstDegreeOfFreedom, secondDegreeOfFreedom)

C#
public double InverseFDistribution( double probability, int firstDegreeOfFreedom, int secondDegreeOfFreedom )

Parameters

probability: The probability for which the F value is required. Allowable range is 0-1.
Probability
firstDegreeOfFreedom: The first degree of freedom.
First Degree of Freedom
secondDegreeOfFreedom: The second degree of freedom.
Second Degree of Freedom

Return Value

Returns value from inverse F distribution function.

Example

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

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

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

Remarks

This method returns the F value for the given F distribution probability.

The F distribution can be used in an F-test that compares the degree of variability in two data sets. For example, income distributions in the United States and Canada can be analyzed to determine whether the two countries have a similar degree of diversity.

Requirements

Target Platforms: Windows 98, Windows NT 4.0, Windows Millennium Edition, Windows 2000, Windows XP Home Edition, Windows XP Professional, Windows Server 2003 family, Windows Vista, Windows Server 2008 family