Question

Excel 2003 Code To Pull Sample % of Data

Asked by: Escanaba

Hello,

Does someone know a way to run a code that will look at a subtotal worksheet and randomly do a 20% group sample pull?
 
Worksheet uses columns A:Q.  Rows can go up to 10,000.

Thanks

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Asked On
2009-10-06 at 05:54:06ID24788602
Tags

Excel

,

VB

,

Sample

Topics

Microsoft Excel Spreadsheet Software

,

VB Objects

,

VB Script

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500
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Answers

 

by: byundtPosted on 2009-10-06 at 10:58:52ID: 25507827

Here is a macro that will randomly select 20% of the rows (columns A through Q only) and copy it to a newly created worksheet. It uses the RAND function to return random numbers, then grabs the bottom 20% of those.

Brad

Sub RandomSelection()
Dim celHome As Range, rg As Range, rgRand As Range
Dim ws As Worksheet
Application.ScreenUpdating = False
Set celHome = ActiveCell
Set rg = Range("A1")    'Header label for column A data
Set rg = Range(rg, Cells(Rows.Count, 1).End(xlUp).Offset(0, 16))    'Columns A:Q through end of data
Set rgRand = rg.Columns(1).Offset(0, rg.Columns.Count)
rgRand.Formula = "=RAND()"
rgRand.Formula = rgRand.Value
rgRand.Cells(1, 1) = "Random"
rgRand.AutoFilter Field:=1, Criteria1:="<=0.20"     '20% sample
Set ws = Worksheets.Add(After:=ActiveWorkbook.Worksheets(ActiveWorkbook.Worksheets.Count))
Application.Goto celHome
rg.Copy ws.Cells(1, 1)
rgRand.AutoFilter
rgRand.ClearContents
Application.ScreenUpdating = True
End Sub

                                              
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by: EscanabaPosted on 2009-10-06 at 13:25:51ID: 25509554

Brad - Thanks for the quick response.  How could this could be altered so that instead of pulling 20% sampling from every row it would pull a 20% sampling per group with a worksheet is subtotaled?  Please see sample file.  It's a small group but on the actual file I'll be dealing with hundereds of groups and would only need a 20% sampling.

Thanks

 

by: byundtPosted on 2009-10-06 at 15:36:59ID: 25510653

You can use the SUBTOTAL function to test whether a cell contains a SUBTOTAL. With your sample workbook, for example:
=SUBTOTAL(103,B2)                 Returns 0 if B2 is blank, a subtotal or grand total cell (or is hidden by the level being collapsed). Returns 1 if B2 contains text or a number.

I've modified the macro to take advantage of this feature. One drawback is that collapsed levels will be expanded after running the macro.

Note that the 103 parameter in SUBTOTAL requires Excel 2003 or later.

Brad

Sub RandomSelection()
Dim celHome As Range, rg As Range, rgRand As Range
Dim iSubtotal As Long
Dim ws As Worksheet
Application.ScreenUpdating = False
Set celHome = ActiveCell
iSubtotal = [B:B].Column    'This column contains the subtotals
Set rg = Range("A1")        'Header label for column A data
Set rg = Range(rg, Cells(Rows.Count, 1).End(xlUp).Offset(0, 16))    'Columns A:Q through end of data
Set rgRand = rg.Columns(1).Offset(0, rg.Columns.Count)
rgRand.FormulaR1C1 = "=IF(SUBTOTAL(103,RC" & iSubtotal & ")=0,"""",RAND())"
rgRand.Formula = rgRand.Value
rgRand.Cells(1, 1) = "Random"
rgRand.AutoFilter Field:=1, Criteria1:="<=0.20"     '20% sample
Set ws = Worksheets.Add(After:=ActiveWorkbook.Worksheets(ActiveWorkbook.Worksheets.Count))
Application.Goto celHome
rg.Copy ws.Cells(1, 1)
rgRand.AutoFilter
rgRand.ClearContents
Application.ScreenUpdating = True
End Sub
                                              
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by: EscanabaPosted on 2009-10-07 at 05:55:57ID: 25514803

Brad - It sounds like we are on the right track and I appreciate your efforts.  Unfortunately when I run the code on the sample file I sent to you it creates the 2nd tab and pulls the header row but there is no data.  

 

by: EscanabaPosted on 2009-10-07 at 06:13:05ID: 25514918

Brad - Ok, I see where the issue is at.  I caught your last line about needing Excel to be 2003 or higher.  The end-user is using Excel 2000 which is what I have to work in which explains why it's not pulling the data.  I copied everything over into Excel 2007 and worked fine.

Is there any way around this so that it will work in Excel 2000?

 

by: byundtPosted on 2009-10-07 at 09:47:53ID: 25517388

If all rows are visible (none hidden by outline levels being collapsed), then you could change statement 11 to:
rgRand.FormulaR1C1 = "=IF(SUBTOTAL(3,RC" & iSubtotal & ")=0,"""",RAND())"

Parameter 3 works just like parameter 103, except that rows hidden manually or by outline levels being collapsed are still detected. With the 103, they are ignored.

Excel 2003 (or possibly 2002) added the 100 series of parameters to the SUBTOTAL function. Parameter values 1 through 11 have worked since Excel 97 (and probably earlier versions as well).

 

by: EscanabaPosted on 2009-10-12 at 08:13:10ID: 31637657

Thanks for all of your help!

20120131-EE-VQP-002

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