geometric mean

[accessuser1023]

does anyone know a couple of equivalent pieces of mathematics to get to this in Access? Here is a link that explains a little bit about it:

http://timothychenallen.blogspot.com/2006/03/sql-calculating-geometric-mean-geomean.html

However, I'm having a problem with summing an entire field. Access does not have a DProduct() function, so it makes the math of "taking the Nth root of a product of 'X' numbers" kind of impossible without writing a custom function.

has anyone run across this before? I realize that this doesn't belong in Access, but none-the-less that is what I have.

 

[spikepl]

I'd recommend reading the entire article ... until the very last line

 

[RainLover]

Your link already has some suggestions so I don't understand the point of the question.

Have you tried to use Access and if so do you get an overflow.

 

[jdraw]

Here is sample code which should help you

Sub geomean()
'
Dim ar(4) As Double '0-4  5 storage locations
Dim av As Double
 ar(0) = 5
 ar(1) = 7
 ar(2) = 55
 ar(3) = 6
 ar(4) = 3
For i = 0 To 4  ' 5 numbers in the sample
 Debug.Print Log(ar(i)); ar(i)  'Display interim values
 av = av + Log(ar(i)) 'natural log
Next i

av = Exp(av / 5)  '  e** (avg/ 5)
MsgBox "Geometric mean  of these 5 numbers is " & av
End Sub

 

[accessuser1023]

Here is sample code which should help you

Sub geomean()
'
Dim ar(4) As Double '0-4  5 storage locations
Dim av As Double
 ar(0) = 5
 ar(1) = 7
 ar(2) = 55
 ar(3) = 6
 ar(4) = 3
For i = 0 To 4  ' 5 numbers in the sample
 Debug.Print Log(ar(i)); ar(i)  'Display interim values
 av = av + Log(ar(i)) 'natural log
Next i

av = Exp(av / 5)  '  e** (avg/ 5)
MsgBox "Geometric mean  of these 5 numbers is " & av
End Sub

this is incredibly useful. Although I was prepared to write a function. For the rest of you, the reason I posted this was because I was on information overload. And of course using Access as a statistical program doesn't help either. But you get paid for what you can get, and you go with the impossibilities sometimes guys.