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Here are a few details:
- The keyword is exact match.
- 100% impression share for November.
- It's opted in Google + Search Network
- US targeting
When logged into the account the keyword tool indicates that the approximate November search volume was 44,830. That estimate is based on exact match and the correct location targeting. Here's what surprised me - the actual number of impressions that keyword received in November was 56,770. Do a little rounding and the estimate provided by the keyword tool comes out within 10% of the real number.
Now of course that's one keyword in one account and in no way am I trying to imply that the keyword tool will be that accurate in all cases. I'm honestly surprised though at just how accurate it is in this case.
Anyone else seeing similar numbers?