Many of us have given out bad information about VLOOKUPS. We’ve said that VLOOKUP always starts its search at the top of our lookup array and it goes step-by-step until it finds the closest or exact match.
That’s called a Liner Search and that’s what happens when we want an exact match. We designate that by using ‘false’ in the formula.
When we want an approximate match, we use ‘true’ and the VLOOKUP does a BINARY SEARCH. In that, the search starts in the middle of the list, eliminates half, then hops to the middle of the remaining half … eliminating chunks of the list until there is either:
1. and exact match
2. 1 choice left, or
3. an error
I detail this in the video.
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For my annotation I use
1. Microsoft’s Snipper Tool
2. Bamboo’s pen & tablet