Don,

AVEDEV returns the Average of the absolute values of the differences between
the values and the average of the values. Using standard functions
(actually, an array formula entered using Ctrl-Shift-Enter) this is the same
as AVEDEV

=AVERAGE(ABS(A2:A11-AVERAGE(A2:A11)))

I get the same value as you for both calcs (34.3%).

Unless you post your manual method, we cannot be sure what you are doing
wrong.

HTH,
Bernie
MS Excel MVP



"Don F" <Don wrote in message
...
I am getting a result that I beleive is incorrect using the AVEDEV formula.
My data is .492, .580, .589, .735, .803, .819, 1.084, 1.413, 1.423 &
1.613.
AVEDEV is giving me a result of 34.3%, but when I do the calculation by
hand,
I get 31.5%. Does anyone have an idea what I might be doing wrong?