THey do do that. They take the worst out, after time and use it to get a more "true" reflection.I believe the current method is the PDGA takes out only rounds that are 100+ points lower than your current rating. So you have to shoot approximately 10-11 strokes worse than your average score for one round. *pplbbbb*
The current PDGA ratings method is:
1. All ratings in events within a year of your most recent event played are considered when calculating your rating.
2. Any round that is either more than 2.5 standard deviations or over 100 points lower than your overall rating (whichever number is lower) are thrown out.
3. The last 25% of your rounds are double rated.
This helps more accurately rate players that are either improving or declining quickly.
The local ratings I do are currently just an average just an overall average of your round ratings. *geek alert * I haven't written the algorithm in Excel that will calculate it the PDGA....it's a little more involved than I thought it was going to be, but that's what I'm planning on doing eventually. I think I'm going to have to get it out of Excel and put it into an Access database to make it work more efficiently. *geek alert off *
FWIW, the USGA calculates handicaps by using the best 10 of your 20 most recent rounds.