Sunday Afternoon mini results: weeks 11-20

[ERicJ]

Originally Posted by JimKelly

No, the SSA comes from certain players ratings and scores.

I just don't have the exact formula for the calculations.

You're both right.

If the course has an SSA for typical conditions you can use that to calculate ratings. That's what the EasyScorecard app uses to generate its ratings. I suspect the PDGA iThingie app works the same way. There is a formula to calculate SSA based purely on course length and foliage that works pretty well.

But the SSA also falls out of sanctioned competitive play in the ratings process. It's the score that would be rated 1,000 for a particular round. Here's a pretty gross explanation of that process (stolen from a PDGA message board post):

Take a round of tournament golf, and average all the player ratings of 800+ rated competitors with at least 8 rated rounds in their history.
Say you get an average of 950 out of them.
Next average all of their scores for that round (assume 18 holes).
Say you get an average of 53.
Then for that round a 53 would be rated 950.
For SSA's in the general range of 48-53 you add or subtract ~10 ratings points per stroke, so 54 is 940-rated, 50 is 980-rated, and 48 is 1000-rated (and thus also the SSA).

As the SSA gets further from 50 the ~10 points value shrinks (for higher SSA) or grows (for lower SSA). Also if you're playing more than 18 holes the ~10 point value changes: roughly 21 holes = 8pts/stroke, 24 holes = 7pts/stroke, 27 holes = 6pts/stroke.

Originally Posted by SlammingSheldon

Based on Birdshot's mini back in 2010 Northside's SSA would be ~48 for 18 holes.

I've got the EasyScorecard SSA's set to:
A tees = 24.7
B tees = 24.5
Junior tees = 19.1

[ChrisMacG]

Originally Posted by ERicJ

I suspect the PDGA iThingie app works the same way.

No, it barely works for ratings and only on some courses. It is very disappointing, the iPhone app. I wish the PDGA would have spent it's money on having a better website.

[JimKelly]

Originally Posted by ERicJ

You're both right.

If the course has an SSA for typical conditions you can use that to calculate ratings. That's what the EasyScorecard app uses to generate its ratings. I suspect the PDGA iThingie app works the same way. There is a formula to calculate SSA based purely on course length and foliage that works pretty well.

But the SSA also falls out of sanctioned competitive play in the ratings process. It's the score that would be rated 1,000 for a particular round. Here's a pretty gross explanation of that process (stolen from a PDGA message board post):

Take a round of tournament golf, and average all the player ratings of 800+ rated competitors with at least 8 rated rounds in their history.
Say you get an average of 950 out of them.948.5
Next average all of their scores for that round (assume 18 holes).
Say you get an average of 53. (49.857)
Then for that round a 53 would be rated 950. (49.857 = 948.5)
For SSA's in the general range of 48-53 you add or subtract ~10 ratings points per stroke, so 54 is 940-rated, 50 is 980-rated, and 48 is 1000-rated (and thus also the SSA).

As the SSA gets further from 50 the ~10 points value shrinks (for higher SSA) or grows (for lower SSA). Also if you're playing more than 18 holes the ~10 point value changes: roughly 21 holes = 8pts/stroke, 24 holes = 7pts/stroke, 27 holes = 6pts/stroke.



I've got the EasyScorecard SSA's set to:
A tees = 24.7
B tees = 24.5
Junior tees = 19.1

Something is missing to this formula.

[frisbeeguy]

Originally Posted by griff

eric, please help before jims head explodes!

uh oh... look out

[frisbeeguy]

Originally Posted by ERicJ

You're both right.

If the course has an SSA for typical conditions you can use that to calculate ratings. That's what the EasyScorecard app uses to generate its ratings. I suspect the PDGA iThingie app works the same way. There is a formula to calculate SSA based purely on course length and foliage that works pretty well.

But the SSA also falls out of sanctioned competitive play in the ratings process. It's the score that would be rated 1,000 for a particular round. Here's a pretty gross explanation of that process (stolen from a PDGA message board post):

Take a round of tournament golf, and average all the player ratings of 800+ rated competitors with at least 8 rated rounds in their history.
Say you get an average of 950 out of them.
Next average all of their scores for that round (assume 18 holes).
Say you get an average of 53.
Then for that round a 53 would be rated 950.
For SSA's in the general range of 48-53 you add or subtract ~10 ratings points per stroke, so 54 is 940-rated, 50 is 980-rated, and 48 is 1000-rated (and thus also the SSA).

As the SSA gets further from 50 the ~10 points value shrinks (for higher SSA) or grows (for lower SSA). Also if you're playing more than 18 holes the ~10 point value changes: roughly 21 holes = 8pts/stroke, 24 holes = 7pts/stroke, 27 holes = 6pts/stroke.



I've got the EasyScorecard SSA's set to:
A tees = 24.7
B tees = 24.5
Junior tees = 19.1

Noooooooo - Eric please don't attempt to explain.... too late, I'm done for -

[ERicJ]

Originally Posted by JimKelly

Something is missing to this formula.

The only other significant detail I left out was: players that score over 2.5 standard deviations below their average are tossed out of the calculations. Otherwise that's basically the way the numbers are calculated. If you think differently you'll need to show your (math) work.

[ERicJ]

Based on Bryan's spreadsheet data...
22 rated players with an average player rating of 939.3
Average score for all those players is 52.1
That puts the rough SSA at 46, but with the SSA down that low it's more like 12 ratings points per stroke which moves the SSA closer to 47... based on the rounds logged out there.

[FlyinBryan]

Here's the entire scores since we started the Sunday mini to give more scores to make better averages.

[griff]

Originally Posted by ERicJ

Based on Bryan's spreadsheet data...
22 rated players with an average player rating of 939.3
Average score for all those players is 52.1
That puts the rough SSA at 46, but with the SSA down that low it's more like 12 ratings points per stroke which moves the SSA closer to 47... based on the rounds logged out there.

that puts hemmy's 42 at about 1056ish ?

[ERicJ]

New numbers based on 28 players:
Average player rating: 942.8
Average round score: 53.1
That puts the SSA around 47.9ish.