Other factors besides the serving option can affect how ads rotate.
For example, if an ad is created late in the day, it will have a lower
ad served percentage at the end of the day than the existing ads. This
difference will lessen as the ad gains new clicks and impressions.
Also, if an ad has yet to be reviewed and approved by AdWords
Specialists, it'll only appear on Google.com. If it isn't yet
generating impressions on the Google Network, an ad will have a lower
ad served percentage.
Hi Rick
I think that when Google rotates your ads, it's rotating their
entrance into the auction. But if you have one ad that wins a top
position in the auction more often than the other, you would see a
resulting imbalance in the % served.
As AndyS said, ad rotation regulates how often an ad is entered into
the auction, but you can imagine that one ad may have a higher quality
score than the other. So, even though Ad A and Ad B is entered into
the auction evenly, Ad A may qualify to show on the first page while
Ad B only qualifies to show on the second page, or not at all. This
will skew the served data in favor of Ad A even though both were
rotated evenly in the auction.
> Hi Rick
> I think that when Google rotates your ads, it's rotating their
> entrance into the auction. But if you have one ad that wins a top
> position in the auction more often than the other, you would see a
> resulting imbalance in the % served.
> Does that make sense?
> AndyS
> On Sep 25, 9:00 am, Rick67 wrote:
> > I have Campaign Settings set to "Rotate: Show ads moreevenly"
> > After 1 day, I find the ads are not rotatedevenly.
> > I assume "%served" means how what percentage of time that ad was
> > displayed when there are two ads in an ad group.
> > I have 3 adgroups, each with two ads. Each ad in the adgroup is only
> > different in the text displayed on the ad.
> > The "% served" is skewed as follows:
> > Ad 1 75%, 25%
> > Ad 2 58% 42%
> > Ad 3 35% 65%
