insert headers first row viz time and data
so database is A1 to B11 including headers

in cells G1 to G3 type===== time,0:00:02 and 0:00:03---this is critera

G1--time
G2--0:00:02
G3--0:00:03

in any other cell type

=DAVERAGE(A1:B11,"data",G1:G3)

see help daverage,
mine excel 2000

kman24 wrote in message
...

Hi all,

I'd be very grateful indeed for any help with this problem!

I have a range of times in column A and corresponding data in column B.
Several data points in column B relate to a given time in column A, and
the number of data points varies for each time (see below):

A B
0:00:01 67
0:00:01 65
0:00:01 56
0:00:01 87
0:00:02 56
0:00:02 78
0:00:03 78
0:00:04 98
0:00:04 65
0:00:05 102

I'm desparately trying to average the data in column B based on a range
defined by column A (e.g. 0:00:02 to 0:00:03 = 70.67). Is there a
function which could do this?

I have thousands of data points so it is a nightmare to select each
range manually!

Thanks very much


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