Dynamic Trend Regression Formula?

Jan 10, 2014

Ok so heres an example workbook:

Book5.xlsx

As you can see from the workbook, each column's amount of numbers depends on the data pulled from an index/match function.

These numbers will change and I want the TREND function to dynamically change with the data.

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Aug 5, 2008

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3. From the chart I get trend line and its equation e.g. 5-order polinominal
4. I convert equation into excel formula
5. I apply formula onto the same range of x argument and produce graph
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=if(c3<b3,"")

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[Attached is a spreadsheet with the actual dataset]

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theory Excel uses for this kind of regression?

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Given 100 samples, to calculate: numbers of hours spent on study is dependent on numbers of hours spent on social networking site.

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y (study)
x^2

xy

6
4
36
16
24

[Code] .......

SUMMARY OUTPUT

SUMMARY OUTPUT

Regression Statistics

Regression Statistics

Multiple R
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[Code] ....

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10514
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I am trying to use the TREND worksheet function on a vba array. I keep getting Runtime error 1004: Unable to get the TREND property of the WorksheetFunction Class. I can bypass the error (like it were a search with no result), but I get no result of any kind from the function. My search of other threads yields nothing concrete, but causes a guess that it may have to be used on a worksheet range not a vba array. But that's not actually stated in any of the threads, and I find no documentation to that effect. Is this the issue or is it something else altogether?

Sub test()
Dim knowny As Variant
Dim knownx As Variant
Dim newx As Integer
Dim myval As Integer
knowny = Array(2, 4, 6, 8, 10)
knownx = Array(1, 2, 3, 4, 5)
newx = 6
'On Error Resume Next
myval = Application.WorksheetFunction.Trend(knowny, knownx, newx)
' 'next error, err as normal.
' On Error GoTo 0
' Err.Clear
Debug.Print myval
End Sub

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For example I have item A.

Sold Month
5 1
7 2
4 3
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=IF('2'!$A:$A,A1,CORREL('2'!$B:$B,'2'!$E:$E))

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