David Johnston

From the notes

Short write-ups of what the ratings and results show, with the numbers and how they were computed.

• How do skipper ratings work?A log-strength fitted to every race at once, smoothed week to week.
• What a rating point is worthA one-point edge is a 73% chance to beat another boat in a race; two points is 88%.
• How does a crew rating work?A crew rating is small and uncertain; a worked example on one roster.

All notes →