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How calculate median

Posted on 2016-11-22
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Last Modified: 2016-11-22
I have a report that shows the record ID and a number field in the detail section.  I can get the average with the sum of the number field divided by the record count in the report footer.

But how can I calculate the median average?
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Question by:SteveL13
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5 Comments
 
LVL 21

Accepted Solution

by:
crystal (strive4peace) - Microsoft MVP, Access earned 500 total points
ID: 41897756
This code averages the 2 middle values if there is not an odd number of values -- you may want to change this. Send it the SQL statement you want it to use where the first field is what you want the median of.
Function GetMedian(sSQL As String) As Double
' 121103 Crystal
' strive4peace

   On Error GoTo Proc_Err
 

   Dim db As DAO.Database _
      , rs As DAO.Recordset
      
   Dim nDbl As Double _
      , nNumValues As Long
   
   Set db = CurrentDb
   Set rs = db.OpenRecordset(sSQL, dbOpenSnapshot)
   
   If Not rs.EOF Then
      With rs
         .MoveLast
         .MoveFirst
         nNumValues = .RecordCount
         Select Case True
         
         Case nNumValues = 1
            GetMedian = Nz(.Fields(0).Value, 0)
            
         Case (nNumValues / 2 - nNumValues \ 2) < 0.001 'even
            'average 2 middle values
            .Move ((nNumValues \ 2) - 1)
            nDbl = Nz(.Fields(0).Value, 0)
            .MoveNext
            GetMedian = (nDbl + Nz(.Fields(0).Value, 0)) / 2
            
         Case Else 'odd
            .Move (nNumValues \ 2)
            GetMedian = Nz(.Fields(0).Value, 0)
         
         End Select
      End With 'rs
   End If
   
Proc_Exit:
   On Error Resume Next
   'release object variables
   If Not rs Is Nothing Then
      rs.Close
      Set rs = Nothing
   End If
   Set db = Nothing
   Exit Function
  
Proc_Err:
   MsgBox Err.Description, , _
        "ERROR " & Err.Number _
        & "   GetMedian"

   Resume Proc_Exit
   Resume
      
End Function

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Author Comment

by:SteveL13
ID: 41897774
Must be doing something wrong or not complete.  I copy/pasted your code in the bottom of the reports VBA editor.  Now how do I make the textbox populate with the median on the report?
0
 
LVL 21
ID: 41897783
=GetMedian("SELECT MyField FROM MyTable WHERE MyConditions")

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substitute :
MyField with the fieldname
MyTable with the table or query name
MyConditions with the criteria
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Author Closing Comment

by:SteveL13
ID: 41898183
Thank you again.  Much appreciated.
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LVL 21
ID: 41898421
you're welcome ~ happy to help
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