Dundas Chart for Windows Forms
Anova Method
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DundasWinChart Assembly > Dundas.Charting.WinControl Namespace > Statistics Class : Anova Method

Visual Basic (Declaration)
Visual Basic (Usage)
C#

probability: The alpha value (probability that the hypothesis is rejected). Allowable range is 0-1.
Probability

inputSeriesNames

A comma-delimited listing of the names of the series to perform the Anova test for.

At least two series must be specified, with each series representing a group of data. Each series must have the same number of data points, otherwise an exception will be thrown.

Input Series Names

Enterprise Edition Only Feature. This method performs an Anova test for two or more series of data.

This analysis tool performs simple analysis of variance (anova) to test the hypothesis that means from two or more samples are equal (drawn from populations with the same mean). This technique expands on the tests for two means, such as the t-test.

Syntax

Visual Basic (Declaration)
Public Function Anova( _ ByVal probability As Double, _ ByVal inputSeriesNames As String _ ) As AnovaResult

Visual Basic (Usage)	Copy Code
`Dim instance As Statistics Dim probability As Double Dim inputSeriesNames As String Dim value As AnovaResult value = instance.Anova(probability, inputSeriesNames)`

C#
public AnovaResult Anova( double probability, string inputSeriesNames )

Parameters

probability

The alpha value (probability that the hypothesis is rejected). Allowable range is 0-1.
Probability

inputSeriesNames

A comma-delimited listing of the names of the series to perform the Anova test for.

At least two series must be specified, with each series representing a group of data. Each series must have the same number of data points, otherwise an exception will be thrown.

Input Series Names

Return Value

Returns Result class from Anova Test

Example

The following sample performs an Anova Test, using Series1, Series2 and Series3 for the input series. The results are returned in an AnovaResult object.

Visual Basic	Copy Code
`Imports Dundas.Charting.WinControl ... Dim result As AnovaResult = Chart1.DataManipulator.Statistics.Anova(.05, "Series1,Series2,Series3")`

C#	Copy Code
`using Dundas.Charting.WinControl; ... AnovaResult result = Chart1.DataManipulator.Statistics.Anova(.05, "Series1,Series2,Series3");`

Remarks

An ANOVA test is used to test the difference between the means of two or more groups of data.

Two or more groups of data (series) must be specified, and each series must have the same number of data points otherwise an exception will be raised.

If a specified input series does not exist in the series collection at the time of the method call than an exception will be thrown.

The results of the test are returned using an AnovaTestResult object, and the following is a brief description of the properties of this class:

Member	Description
SumOfSquaresBetweenGroups	Sum of squares between groups.
SumOfSquaresWithinGroups	Sum of squares within groups.
SumOfSquaresTotal	Total sum of squares.
DegreeOfFreedomBetweenGroups	Degree of freedom between groups.
DegreeOfFreedomWithinGroups	Degree of freedom within groups.
DegreeOfFreedomTotal	Total degree of freedom.
MeanSquareVarianceBetweenGroups	The mean square of variance between the groups.
FRatio	The F ratio.
FCriticalValue	The F critical value.

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