VB Trend Function - like Excel

[Mark]

Hi - is there a function (or does anyone have any code) which replicates
the TREND function in Excel:

TREND(y, ,newx)

I work in a call centre, and would like to predict the grade of service
at the end of the month - based on the grade of service for each day of
the month so far. I would like to have this contained within my vb.net
web application, and not have to export data to Excel, then add the
formulas, then create the report and reupload to our management portal.

Any help/suggestions would be really appreciated.

Thanks, Mark

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[Mark]

Hi - found it, in case anyone's interested:

Public Sub LRegression(ByVal X() As Double, ByVal Y() As Double, ByRef
Slope As Double, ByRef YInt As Double)
Dim dblWork() As Object
Dim dblXMean As Double
Dim dblYMean As Double
Dim dblSumXX As Double
Dim dblSumXY As Double
Dim dblSumYY As Double
Dim dblSlope As Double
Dim dblYInt As Double
Dim lVCnt As Long
Dim i As Long
lVCnt = UBound(X)
If (lVCnt <UBound(Y)) And (lVCnt 1) Then _
Err.Raise(17, , "Arrays must match in number of vectors and
have a count greater than 1.")

lVCnt = lVCnt + 1

ReDim dblWork(lVCnt)

For i = 0 To lVCnt - 1
dblXMean = dblXMean + X(i)
Next i
dblXMean = dblXMean / lVCnt

For i = 0 To lVCnt - 1
dblYMean = dblYMean + Y(i)
Next i
dblYMean = dblYMean / lVCnt

For i = 0 To lVCnt - 1
dblSumXX = dblSumXX + (X(i) - dblXMean) * (X(i) - dblXMean)
Next i

For i = 0 To lVCnt - 1
dblSumYY = (dblSumYY + Y(i) - dblYMean) * (Y(i) - dblYMean)
Next i

For i = 0 To lVCnt - 1
dblSumXY = dblSumXY + (X(i) - dblXMean) * (Y(i) - dblYMean)
Next i

dblSlope = dblSumXY / dblSumXX
dblYInt = dblYMean - (dblSlope * dblXMean)

Slope = Math.Round(dblSlope, 2)
YInt = Math.Round(dblYInt, 2)
End Sub

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