Solved

Random classification of records

Posted on 2014-04-07
8
87 Views
Last Modified: 2014-04-09
Hello, I would like to randomly classify each of the attached 201 data records into one of 5 groups. Four of the groups will contain 40 records, and a fifth group will contain 41 records.

The group number (1-5) should be contained in column C.

Does anyone have a suggestion on how to randomly generate these five groups?

Many thanks in advance.
RandomClasses.xlsx
0
Comment
Question by:dougf1r
  • 5
  • 3
8 Comments
 
LVL 7

Expert Comment

by:COACHMAN99
ID: 39984338
if you place the formula in a spare column and recalc the sheet, you should be close.
RANDBETWEEN( 1, 5 ),
you should then sum each assignment (1-5) to ensure you have a balanced distribution.
0
 
LVL 1

Author Comment

by:dougf1r
ID: 39984352
How can this be modified such that I have 4 equal-sized groups (n=40) and one group with n=41?
0
 
LVL 7

Expert Comment

by:COACHMAN99
ID: 39984362
Without running a small macro, populating each cell, and keeping a running total, I don't know. The above will be close.
Do you have to repeat this, or is it a once-off?
0
Free Tool: Postgres Monitoring System

A PHP and Perl based system to collect and display usage statistics from PostgreSQL databases.

One of a set of tools we are providing to everyone as a way of saying thank you for being a part of the community.

 
LVL 1

Author Comment

by:dougf1r
ID: 39984393
I will need to repeat this.

A small macro does seem that it would be most helpful. I am unsure of the proper code to carry this out.

Might someone be comfortable putting this code together?
0
 
LVL 7

Expert Comment

by:COACHMAN99
ID: 39984467
try this (you will need to add the vba-addin
In Excel, install the Analysis toolpack -VBA from Tools Addins.
Then in VBA, click Tools - References and put a checkmark on atpvbaen.xls
The problem with this is if you share your book, the other person must also have the analysis toolpack-vba addin installed.

Sub PopVals()
Dim vval As Long
Dim counts(5) As Long
x = 1
While x <= 201
  vval = WorksheetFunction.RandBetween(1, 5)
  Worksheets("Sheet2").Cells(x, 3) = vval
  vval = vval - 1
  If counts(vval) < 51 And vval < 5 Then
    counts(vval) = counts(vval + 1)
    x = x + 1
  End If
  If counts(vval) < 52 And vval = 5 Then
    counts(vval) = counts(vval + 1)
    x = x + 1
  End If
Wend

End Sub
0
 
LVL 7

Expert Comment

by:COACHMAN99
ID: 39984485
The above isn't correct - please wait for a better response - I have to go.
0
 
LVL 7

Accepted Solution

by:
COACHMAN99 earned 500 total points
ID: 39984747
Here you go:
Sub PopVals()
Dim vval As Long
Dim counts(5) As Long
x = 1
Range("C1:C201") = ""
While x <= 201
  vval = WorksheetFunction.RandBetween(1, 5)
  Worksheets("Sheet2").Cells(x, 3) = vval
  vval = vval - 1
  If counts(vval) < 40 And vval < 4 Then
    counts(vval) = counts(vval) + 1
    x = x + 1
  End If
  If counts(vval) < 41 And vval = 4 Then
    counts(vval) = counts(vval) + 1
    x = x + 1
  End If
Wend

End Sub
0
 
LVL 1

Author Comment

by:dougf1r
ID: 39990166
Works perfectly. Many thanks!
0

Featured Post

Free Tool: IP Lookup

Get more info about an IP address or domain name, such as organization, abuse contacts and geolocation.

One of a set of tools we are providing to everyone as a way of saying thank you for being a part of the community.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Improved? Move/Copy Add-in Replacement - How to avoid the annoying, “A formula or sheet you want to move or copy contains the name XXX, which already exists on the destination worksheet.” David Miller (dlmille)  It was one of those days… I wa…
Do you use a spreadsheet like Microsoft's Excel?  Have you ever wanted to link out to a non excel file on your computer or network drive?  This is the way I found to do it!
This Micro Tutorial will demonstrate on a Mac how to change the sort order for chart legend values and decrpyt the intimidating chart menu.
This Micro Tutorial will demonstrate how to use a scrolling table in Microsoft Excel using the INDEX function.

839 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question