I've recently been looking at some of the personalization statistics offered in Sitecore's Experience Editor and noticed that some of the numbers are not correct. I'm not sure if this is an issue in Sitecore, or an error in the documentation that describes the statistic. Specifically, I am looking at the "Reach" statistic that's shown in the "Personalized Experience" dialog of the Experience Editor.
According to the documentation (found here), Reach is "the reach of the currently selected rule, which is expressed as the number of visitors that meet the condition and the percentage of all visitors that this number represents". The calculation is documented as "Reach = (Visitors that match the condition/All visitors) x 100". The dialog mentions that it does this calculation for the last 30 days if A/B tests are not in place (which is true in my case).
The personalization rule that I've set up is a simple one that changes the data source of the component when a particular page is visited during the current visit. When I look at the statistics for the rule, however, I see that the dialog shows 8 visitors that met the condition, which accounts to 97% reach. I can't see how that's correct, considering that Sitecore Analytics shows over 4,000 hits to the page specified in the rule during the 30 day period. The default condition shows about 8,000 visitors that met the condition, which accounts for 3% reach. That also seems incorrect based on what I'm looking at in Sitecore Analytics.
So there's basically a couple of issues I'm trying to understand with that statistic: How are the number of visitors that match the condition so small, when analytics show many page hits to the page? Secondly, how can "Reach", as defined in the documentation, be 97% for the 8 visitors that matched the condition vs. 3% for the 8,000 that met the default condition?
Any knowledge you can share about this issue will be greatly appreciated!