I've noticed a number of hits from unexpected search terms in my stats for fairly new pages which I've only been able to reproduce by invoking some of the search tools such as 'past month', 'past year' etc. Has anyone conducted any research into the proportion of searches that are affected by these filters?
This is also a guess, or a hint of an idea on how to quantify this - however roughly.
When you look in your query terms stats inside Webmaster Tools, you notice that you get some impressions at a wildly different position than the norm. I'm assuming that some part of those impressions comes from Search Options being used. So that number would be the ceiling number - the maximum. In reality, there are several other reasons you might get a wildly different ranking, so the true number of search options users is going to be lower.
[edited by: tedster at 1:58 am (utc) on Aug 27, 2010]