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adsense: how do you juggle between ad units and link units?

I have a site that's making a small amount of adsense income (about 25k impressions per day). I am experimenting with both ad and link units, so I've set up a system that lets me define the ratio between the two (eg 30% of impressions to link units, 70% to ad units). The problem is that the "winning" eCPM (the unit with the maximum eCPM) keeps flipping back and forth, and it's not always by a small amount either. For example:

yesterday:
linkunit 7815 impressions $0.37 eCPM
adunit 17853 impressions $0.85 eCPM

ok, right choice there, but so far today link units are making a better eCPM...

linkunit 1869 impressions $1.02 eCPM
adunit 15259 impressions $0.84 eCPM

If you use both link and ad units, do you have a system to decide between the two?

longer testing ? thats about all i do

Quote:

Originally Posted by SmokeyTheBear (Post 15559943)

longer testing ? thats about all i do

What if the long term trends are not consistent with short term? You're missing out on $.

It's a pity G don't have a stats API to automate it and squeeze out the maximum benefit... I guess I could do something manually like:

Code:

if (stats file manually updated less than 24 hours ago) {

  total = adunit eCPM + adlink eCPM

  number = random(total)

  if (number <= adunit eCPM) {

    displaytype = adunit

  } else {

    displaytype = adlink

  }

}