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First, if you have not already, read Yahoo Quality Score - 5 Bar Experiment Part 1.
Well, this "experiment" has turned out to be rather boring as a series. I make one easy change and look back in 48 hours and boom a 4 bar quality score. DOH. So what do I do? I get ready to post about it today to find that the 4 bar quality score turned into a 5 bar this morning. DOH Again.
I guess it goes to show how easily a 5 bar quality score can be achieved with some proper tuning. A couple reasons why I think it jumped to such a high quality score:
- Removing excess keywords increases the "relevancy" of the keywords to the Ad
- Removing excess keywords can increase Click through rates
I went from hundreds of keywords down to about 50 or so keywords that were actually pulling in impressions and clicks.
I think I'm going to continue this challenge in part 3 with a new, harder experiment - maybe even in google. 
I would love to see some stats in terms of the net increase in traffic with this experiment. Maybe some percentages like… By going from X bars to Y bars I saw a xx% increase in clicks and a yy% decrease in overall CPC. Thanks for the good info, keep it coming.
Great info on your blog!
am wondering why, for this YSM campaign you are making the test on, you don’t do 1 keyword = 1 adgroup, like you would do on an Adwords Search campaign?
is there an advantage for QS to do so on YSM?
Or is it because this is a Content network campaign?
Thanks