In , Dallman Ross <dman@localhost. spake thusly:

I'm interested in averaging some column ranges. I'm stuck
because I don't see an easy way to find the row number of the
last row with data in it.

For example, assume some stock data:

A B C D E F
Date Open Hi Lo Close Vol
1 4/23 20.00 20.41 19.82 19.89 1,000,000
2 4/28 19.81 21.01 19.81 20.92 1,111,111
3 4/30 21.11 21.81 21.11 21.80 1,010,101
4 5/13 24.14 24.26 24.01 24.02 2,322,122
5 5/19 22.22 23.33 22.13 22.51 1,732,222

And so on. Not every date is filled. (Only trading
days, but let's not even assume that much.) So
suppose I want to average May's data for the close.
I need to know that the data ends on Row 5. Then
I need to average only entries that show May in Col. A.
can someone help me do this?

Okay, I've made a good bit of progress (have also been reading
some articles here).

for example,

=SUMIF($A:$A,"" &TODAY()-60,G:G)/COUNTIF($A:$A,"" &TODAY()-60)

gives me an average of col. G for the last 60 days' data.

Okay, but how do I find the average of data from 31 days ago
through 60 days ago, i.e., the previous month's alone?

dman