I have been trying to manually calculate my rating based on the rounds available on this site. No matter what I do, I can't get my average to equal out to my rating. I was reading another thread about standard deviation between rounds and I can't trust that yet because I can't even calculate the rating correctly.

Are there adjustments that aren't obvious with the available data? Or is the calculation more than just a simple average?

www.pdga.com/competition/ratings/06RatingsGuide.doc (http://www.pdga.com/competition/ratings/06RatingsGuide.doc)

We're working on a downloadable calculator that will get people close. You'll usually be 1 or 2 points lower than what your rating will end up because all round ratings displayed have been converted and rounded down from "per hole" values we have in the database. We do your actual rating calculation with your actual "per hole" ratings without rounding down until the final value that becomes your rating.

I have read and re-read and recalculated and can't get the number I currently have. Is there a mathematical equation I can look at instead of an english description of how to calculate ratings?

-Daniel

This is from sandalman last June in the Ask Chuck Kennedy thread:


ok boyz'n'girlz, herre is something. it is basic, no frills, but pretty darn accurate.

ratings calculator (http://www.earthoffice.net/discgolf/ratings_predictor.xls)

its an excel spreadsheet... just replace my data with your own and boom, out comes your anticipated rating.

ideas = welcome



I've been using it since and I've been within one point each update (because of fluctating official and unofficial ratings.)

You have 8 rounds in your Ratings Detail. The two highest rated rounds (25%) in your most recent event got double weighted. I come up with 875.6 averaging those 10 rounds (the 2 highest ones are counted twice) and your posted rating is 876. Seems pretty close.

My low round for the next update is 6 points too high to be dropped. :mad:

How do you know?

How do you know?



Standard deviation for my rounds is 34. 2.5 standard deviations is 85 points. My low round is 79 points below the average of my last year's rounds, with the most recent 25% weighted double. :D

Unless I can slip you a 10-spot to make that 795 round disappear. :eek:

I believe determining whether to drop a round is based on your non weighted average but that might not help? Another little tweak is that if a dropped round should have ended up being one to be double weighted, another round is not added to the doubling process. You just end up with one less round doubled.

Chuck, is there an easy way to get a rough idea of ratings for a tourney?

First, I would see if the results are available online for the previous year or years. You can then click on the course statistics to see what configs were played and match your score in the list of results and the rating that goes with it.

If that doesn't work, check the Course Stats to see what SSA values have been generated for the course layouts. www.pdga.com/tournament/course_ratings_by_course.php (http://www.pdga.com/tournament/course_ratings_by_course.php) From the stats, you can go to the event online and see what scores got what ratings.

If the course doesn't have any online stats yet, look at other courses in your state and find one that's comparable. Go to the results that produced those SSA values and see what scores got what ratings.

You have 8 rounds in your Ratings Detail. The two highest rated rounds (25%) in your most recent event got double weighted. I come up with 875.6 averaging those 10 rounds (the 2 highest ones are counted twice) and your posted rating is 876. Seems pretty close.



Your most recent 25% (1/4) of your rounds will be double weighted in the calculation so your current performance is slightly more important.

Aha, two highest from your most recent event, that clarifies the above line from the article tremendously. Thank you so much.

-Daniel