For a while I wanted to write this post about the Google Analytics sampling. You know, the dreaded message that appears on top of your reports:
This message shows up when you work with a dataset that contains more than 500.000 visits or more than 1.000.000 items (keywords/url's/etc). Above that Google takes a sample of all those visits to calculate the numbers for your reports. But what is acceptable? In this example Google uses 30.62% of all visits to guess what the other 70% did on my site...
Last months I had quite some clients that started a content experiment but didn't see data comming in:
In almost all those cases the solution was pretty easy: they had a custom Google Analytics code for multiple domain tracking. And that means you need to make some changes to the Content Experiments script also. This is an example of a changed Google Analytics tracking code: