I need help. (Obviously)

How can I find simple (and weighted) averages of a column of numbers...
but not the entire column. Example, I have a column of 50 data points
and want to average the last 8 numbers only. The trick here is that my
data set is 50 columns wide as well, but each successive column gets
one number less. So Column A has 50, from row 1 to 50, Column b has row
1 to 49 etc. all the way to one row only out at column 50. I want to
average the last 8 numbers only and then drag my formula across all
columns and not have to go into the formula bar and change my array by
one row for each column.

Does this make sense? If anyone is an actuary I am working on insurance
loss development triangles if that helps. I am trying to make getting my
LDF picks easier.

Thanks,

Jason


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Bootroots
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