Tim,

With the 'After' numbers in B1:B100, and the 'Before' numbers in A1:A100,
you can array enter (enter using Ctrl-Shift-Enter)

=MIN(B1:B100-A1:A100)
=MAX(B1:B100-A1:A100)
=MEDIAN(B1:B100-A1:A100)
=QUARTILE(B1:B100-A1:A100,1)
=QUARTILE(B1:B100-A1:A100,2)
=QUARTILE(B1:B100-A1:A100,3)
=QUARTILE(B1:B100-A1:A100,4)

Note that you must match your data range exactly - these won't work with
blanks the way Min and Max usually will.

HTH,
Bernie
MS Excel MVP

"Tim Archer" wrote in message
...
Hi there,

I have two columns of data before and after and event and
I want to find the median, min, max and quartiles of the
change that has occured (after - before). I can easily
make another column to calculate the differences and
perform the statistics very easily. I already have a lot
of columns so I wanted to find ways of saving space and
since this is a calculation that I do for a number of
variables it would certainly free up columns for me. I
have found functions such as sumx2py2 that act in the way
that I am looking for, but I do not need to find the sum
of the squared differences, I just want to find the
minimum of the differences. Are there functions in Excel
that can do this?

Many thanks

Tim Archer