Lookup and compare in two tables at the same time

[Ondin]

Hi there. I have a little bit of a problem and was wondering if anyone here could possibly help me? Here is a simplified problem:

Time = 1 (beginning)
Item In/Out
1 In
2 In
3 Out

Time = 2 (end)
Item In/Out
1 Out
2 In
3 Out

I need a formula that can calculate which percentage of items that are "in" in the beginning are "in" in the end, which percentage of items that are "out" in the beginning are "in" in the end, which percentage of items that are "in" in the beginning are "out" in the end, and finally which percentage of items that are "out" in the beginning are "out" in the end.

For example, 50% of items that are "in" in the beginning are "in" in the end (2 in the beginning, 1 in the end). 100% of items that are "out" in the beginning are "out" in the end.

Should I use some kind of a VLOOKUP function for this particular problem?

Regards,
Ondin.

[pike]

Hi Ondin
Its a hard one but,
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one suggestion would be "formula to calculate % of items"