Problem with that is that it averages blanks as well. I also noticed that
the last date is inverted in comparison to the others. Both can be overcome
with

=AVERAGE(IF(B1:B34-A1:A34<0,ABS(B1:B34-A1:A34)))

which is still an array form ula.

--
HTH

Bob Phillips

"R.VENKATARAMAN" wrote in message
...


your data is A! to A14 abd B1 to B14


try this in any cell

=AVERAGE(A1:A14-B1:B14)
this is array formula . so DONT hit enter but hit control+shift+enter
I have used numbers instead of dates. I expect this to work even with
dates
provided cells are in date foramt.



Krishna Mohan wrote in message
...
Hi,
I have a situation like this below..
18-Feb-02 02-Jun-04
26-Jul-02 08-Jun-04
29-Jul-03 10-Jun-04
22-Oct-03 05-Jun-04
01-Nov-03 10-Jun-04
11-Nov-03 14-Jun-04
18-Nov-03 04-Jun-04
20-Dec-03 21-May-04
30-Mar-04 10-Jun-04
08-May-04 22-Jun-04
29-May-04 15-Aug-04


11-Jun-04 11-Jul-04
12-Jun-04 16-Jun-04
22-Jun-04 28-Jun-04
24-Jun-04 26-Jun-04

10-Dec-04 23-Dec-04



28-Aug-04 01-Sep-04
28-Sep-04 29-Sep-04
08-Dec-04 22-Dec-04

20-Aug-04 29-Aug-04

25-Aug-04 31-Aug-04
30-Aug-04 10-Sep-04
03-Jan-05 10-Jan-05
27-Sep-04 05-Oct-04
30-Sep-04 07-Oct-04
03-Oct-04 04-Oct-04

The above are two columns of excel. I want to calculate the average of
the
difference for each month in another work sheet like bwlow

Month Difference..

Can some one help me on how I can do that