If you are an AdSense scientist, you keep on experimenting on your AdSense ad placements and other factors that will affect your ad click-through-rate, you will be interested with this experiment that dealt with the use of the Google Search box:
I’ve been toying around with Google Adsense Search on my other blogs and concluded that by using Google Search, a blog’s Google Adsense CTR could be greatly reduced by 1%, I’ve done some experiment for the past few months between February and April, and the blog that I experimented on has a drop of in CTR for that month which translate into a drop of earning in term of dollars, for your information, traffic to my blog increases every month.
Read the details of this Google Search box and AdSense experiment from GeckoandFly
