Ratings v. 1.2

Version 1.2 has been implemented as of November 1, 2021. The main update is an improvement on how to regress the ratings of teams that have played a few games. In the Bradley-Terry algorithm, we adjust the team’s winning percentage by adding two wins and two losses to its record.

This seems to handle brand new teams a bit better that the method used in v. 1.1. It especially improves the rating for teams that have a poor winning percentage in their first event or two. In v. 1.1, those teams were given unrealistically poor ratings.

I have also changed the minimum games threshold so that teams that have not played games in the current season are more quickly removed from the ratings. All inactive/retired teams are now removed after January 1st.

If you want the basic nuts and bolts of my ratings philosophy and some of the design choices in v. 1.0, along with the differences between my ratings and the World Curling Tour’s rankings, go here.

A description of updates made in version 1.1 can be found here.