Enterprise Edition Only Feature. This method returns the probability for the T distribution (student's distribution).

Returns the Percentage Points (probability) for the Student t-distribution where a numeric value (x) is a calculated value of t for which the Percentage Points are to be computed. The t-distribution is used in the hypothesis testing of small sample data sets. Use this function in place of a table of critical values for the t-distribution.

Syntax

Visual Basic (Declaration)
Public Function TDistribution( _ ByVal tValue As Double, _ ByVal degreeOfFreedom As Integer, _ ByVal oneTail As Boolean _ ) As Double

Visual Basic (Usage)	Copy Code
`Dim instance As Statistics Dim tValue As Double Dim degreeOfFreedom As Integer Dim oneTail As Boolean Dim value As Double value = instance.TDistribution(tValue, degreeOfFreedom, oneTail)`

C#
public double TDistribution( double tValue, int degreeOfFreedom, bool oneTail )

Parameters

tValue: The T value for which the distribution probability is required.
T value
degreeOfFreedom: The degree of freedom.
Degree of Freedom
oneTail: If true the probability is one-tailed, if not it is two-tailed.
Returns the one-tailed distribution

Return Value

Returns T Distribution cumulative function

Example

The following sample calculates the T distribution probability.

Visual Basic	Copy Code
`Imports Dundas.Charting.WebControl<CRLF>...<CRLF><CRLF>' Calculate T distribution probability for one-tailed distribution<CRLF>Dim result As Double = Chart1.DataManipulator.Statistics.TDistribution(1.96,30,true)`

C#	Copy Code
`using Dundas.Charting.WebControl;<CRLF>...<CRLF><CRLF>// Calculate T distribution probability for one-tailed distribution<CRLF>double result = Chart1.DataManipulator.Statistics.TDistribution(1.96,30,true);`

Remarks

This method returns the probability for the T distribution, which is otherwise known as the student's distribution.

Use this function in place of a table of critical values for the t-distribution.

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