Hi all,
First time poster, so appologies if you have already covere this one - although I was unable to find it.
I'm using Excel 2007 and have a very large, but simple table with sequential months along the top of the first row. Then in each column I have a list of data (customers). I'm trying to find out how long each customer stays.
I can use an ISNA(match(... to find out the retention of the first month's customers in each of the subsequent months by just counting up how many of the 1st month's customers are still there in the following months. The problem I have is how to handle the following months new customers as the ISNA(match(... route will only work if all the customers in the month in question are new.
In month 2 there will be a combination of customers from month 1 and new ones in month 2. In month 3 there will be new customers, and customers from months 1 and 2...and so on...
Any ideas of how to acheive this? I've been told to use COUNTIF and complicated count tables, but this is beyond my skill levels.
Any tips would be most appreciated!
Thanks!
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