For more than half of the SERPs

[fomayof928@mowline]

How did the effect break?
A single data point doesn’t tell us much about what’s happening in each bucket. For this analysis, I’m going to use the exact duplicate count, because once we have to put them into bins, the percentages can get a little confusing. Another complication is that, on occasion, two sites have more than one organic result – this brings down the overall SERP diversity, but doesn’t necessarily mean that one site is dominant.

So, what if we just looked at the count of the dominant site (the site with the most duplicates) in the 10,000 SERPs? We'll compare June 6th (blue) to June 7th (purple):


in our data set, there were no duplicates (each site had bahrain number data one listing), and this number did not change much after the update. The number of sites with two listings (i.e., one duplicate) increased significantly after the update (to 346 SERPs). This was almost entirely offset by a decrease in SERPs with three to five listings (a decrease of 345 SERPs across the three bins).

The numbers get too small to see at a 5K scale after four count SERPs, so I'll limit the Y-axis:


The proportion of SERPs with dominant sites owning six to ten organic listings was only 117 out of 10,000 SERPs (just over 1 percent) on June 6. After the update, this actually increased slightly to 119 SERPs.