I was working on some data once, calculating by a lot of criteria whether or not one of 8,000 computers was supposed to get an operating system upgrade, or if we just needed to buy a new computer. I had a formula to evaluate it based on some 10 or 12 criteria.
Then I hit this one computer and in looking at it, knew that the evaluation in my formula turned up the wrong result.
Oh dear. (Only I didn’t say “Oh, dear.”)
I was looking at thousands of computers. What if I got some others wrong? (Hint: Yes, the result was wrong in about 150 cases).
I rewrote the formula, tested it against some known results, and yes! Turned out correctly.
So, I had to copy that formula down an 8,000-row column, didn’t I?
No, I blasted well didn’t. That’s where the beauty of tables in Excel comes in.
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