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I noticed that your match rating is approximately your opponents rating plus percentage of games won minus 0.5. So if your opponent is a 4.25 and you win 6-3 6-3 then you won 66% of the games. Your match rating is 4.25+0.66-0.5 = 4.41. Or there abouts.

But if that is the calculation, then your own rating makes no difference, right?

I have no idea if you’re right or wrong.

But if that is the calculation, then your own rating makes no difference, right?

But if that is the calculation, then your own rating makes no difference, right?

I agree that your own rating before the match definitely has an influence on it. I have been told that it is your rating before your third to last match averaged with your last three matches. This gets it close, but not quite. And it doesn’t address how a rating for an individual match is calculated.

I would expect tls and tr probably use some kind of “expected result” in their match calculations as well. If that’s wrong, then it doesn’t matter if their dynamic rating calculation is correct or not; garbage in, garbage out. My guess is they have both the match rating and dynamic rating calculation incorrect.

@schmke could probably speak more intelligently on the subject than any other on these boards. Or maybe not because from everything i read (and he’s told me), his calculations more accurately predict the usta calculations than either tls or tr.

So I took about 50 singles results and plotted game percentage vs the difference between opponent and match rating and its almost a perfect linear fit. The only outliers were against opponents playing up. Also, the TR guy might not be using match ratings in the rating calculation or not averaging them directly. Here's some results from the website.

Match DNTRP

3.88 3.88

3.83 3.88

4.19 3.95

3.73 3.84

3.90 3.88

4.03 3.89

The last match rating was the same as both the previous and current rating. So that last match rating would have had to replace another 3.88 rating for it to not influence the dynamic rating. There was no 3.88 in the previous 6 matches and futher. So either the match rating is not used in the calc or the matches are not weighted equally.

Match DNTRP

3.88 3.88

3.83 3.88

4.19 3.95

3.73 3.84

3.90 3.88

4.03 3.89

The last match rating was the same as both the previous and current rating. So that last match rating would have had to replace another 3.88 rating for it to not influence the dynamic rating. There was no 3.88 in the previous 6 matches and futher. So either the match rating is not used in the calc or the matches are not weighted equally.

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Yes, and you add 0.5. So instead of 4.25+0.66-0.5=4.41, it's 4.25-0.66+0.5=4.09

Also they seem to they seem to trash everyone’s rating from last year. Like if they predicted a bump from a dNTRP or 4.03 and that person stayed a 4.0 they just started them at top or bottom of level depending on how you look at it

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Not being sarcastic, but how were you smart enough to figure TR’s formula? You just guessed around with random people’s ratings?

Also they seem to they seem to trash everyone’s rating from last year. Like if they predicted a bump from a dNTRP or 4.03 and that person stayed a 4.0 they just started them at top or bottom of level depending on how you look at it

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Also they seem to they seem to trash everyone’s rating from last year. Like if they predicted a bump from a dNTRP or 4.03 and that person stayed a 4.0 they just started them at top or bottom of level depending on how you look at it

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On your second point, even if TR had the actual formula used by the USTA, they would also need all the current dNTRP ratings to calculate forward. The only time they get actual confirmation of dNTRP is when someone moves up or down. So they can only adjust once a year.

Match DNTRP

3.88 3.88

3.83 3.88

4.19 3.95

3.73 3.84

3.90 3.88

4.03 3.89

The last match rating was the same as both the previous and current rating. So that last match rating would have had to replace another 3.88 rating for it to not influence the dynamic rating. There was no 3.88 in the previous 6 matches and futher. So either the match rating is not used in the calc or the matches are not weighted equally.

But if that is the calculation, then your own rating makes no difference, right?

When you see this repeating in TR, it usually means one of the players is self-rated in their first two matches and therefore has no rating, and the match is just used to set that player's rating and everyone else's is just brought forward from the existing value.