Microsoft SQL Server Analysis Services Function Page
Function Name:	LinRegVariance
Category:	Statistical
Description:	The LinRegVariance function calculates the linear regression for the supplied set and returns the variance for the regression line (y = ax + b).
Syntax:	LINREGVARIANCE( «Set», «Numeric Expression»[, «Numeric Expression»] )
Technet Link:	MDX LinRegVariance Function

The query below returns the variance values based on the regression line for the Month members for the FY 2003 member.   WITH       MEMBER Measures.[OrderCountVariance] AS        LINREGVARIANCE(LASTPERIODS(30) AS       [TimeSet], [Measures].[Order Count], RANK([Date].[Fiscal].CurrentMember, [TimeSet])) SELECT       {[Measures].[OrderCountVariance]} ON COLUMNS,       DESCENDANTS([Date].[Fiscal].[FY 2003], [Date].[Fiscal].[Month]) ON ROWS FROM       [Adventure Works]