S.Q.T. (stupid question thread) - Page 30 - MensTennisForums.com

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post #436 of 2138 (permalink) Old 06-05-2013, 11:00 PM
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Re: S.Q.T. (stupid question thread)

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Very funny.
I hate to admit it but it was a serious question...

Whilst watching tennis it's just never something that has really crossed my mind..
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post #437 of 2138 (permalink) Old 06-06-2013, 12:48 AM
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Re: S.Q.T. (stupid question thread)

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Accidently touching the bottom of the net with your foot shouldnt cost you the point.
)
Balls that land just a millimetre out shouldn't cost you the point. After all, it was that close to being a winner. So just missing by a millimetre shouldn't cost you the point.

Seriously, the best games are those with the simplest, clearest rules. A rule for just touching the net slightly and a different rule for touching it more than slightly would make things impossible.

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post #438 of 2138 (permalink) Old 06-07-2013, 11:50 AM
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Re: S.Q.T. (stupid question thread)

Are there any night matches at this years Roland Garros? Would Jo/Ferrer be postponed if Nodul is a five setter?

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post #439 of 2138 (permalink) Old 06-07-2013, 01:42 PM Thread Starter
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Re: S.Q.T. (stupid question thread)

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Are there any night matches at this years Roland Garros? Would Jo/Ferrer be postponed if Nodul is a five setter?
No, for some reason Trolland Garros organizers haven't made the investment that even 250s do, install lights.

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post #440 of 2138 (permalink) Old 06-07-2013, 02:33 PM
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Re: S.Q.T. (stupid question thread)

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No, for some reason Trolland Garros organizers haven't made the investment that even 250s do, install lights.
Can not believe it.

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post #441 of 2138 (permalink) Old 06-07-2013, 03:23 PM
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Re: S.Q.T. (stupid question thread)

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No, for some reason Trolland Garros organizers haven't made the investment that even 250s do, install lights.
I thought the reason there are no night matches at RG is that the city won't allow it.
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post #442 of 2138 (permalink) Old 06-07-2013, 03:32 PM
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Re: S.Q.T. (stupid question thread)

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No, for some reason Trolland Garros organizers haven't made the investment that even 250s do, install lights.
I think it's because they are trying to stay traditional, the same reason they won't bring in Hawk-eye.
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post #443 of 2138 (permalink) Old 06-07-2013, 04:01 PM Thread Starter
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Re: S.Q.T. (stupid question thread)

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I think it's because they are trying to stay traditional, the same reason they won't bring in Hawk-eye.
I think the biggest reason has been that they haven't felt need for lights. Sun sets in Paris at 9:45pm which is later than at any other slam. In London it's 9pm, in NYC it's 7:30pm, in Melbourne it's 8:30pm. I think they thought 9:45pm is enough late to stap play.

But now even 250s have lights and so should RG have too. But I think they aren't too willing to make any investments to RG before they know a slam can be held there also in the future.

And I don't think traditionalism is the reason for no Hawkeye, it's used nowhere on clay. Hawkeye just has some issues on clay.

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post #444 of 2138 (permalink) Old 06-08-2013, 09:49 PM
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Re: S.Q.T. (stupid question thread)

Is there a rule on when it is allowed to water the court?

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post #445 of 2138 (permalink) Old 06-08-2013, 10:49 PM
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Re: S.Q.T. (stupid question thread)

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Is there a rule on when it is allowed to water the court?
It's not really an answer, but the grand slams rulebook doesn't contain any info about that (I was wondering that as well).

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post #446 of 2138 (permalink) Old 06-09-2013, 12:06 AM
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Re: S.Q.T. (stupid question thread)

Can anyone explain to me exactly how Hawkeye's margin of error works. What I read by searching around was that they claim it has a 3.6 mm margin of error.

My understanding of this is as that if you took any discrete point within the distribution of the ball that they draw on the image it produces, that corresponding point of the ball could actually lie within 3.6mm along any vector drawn in any direction from that point. The collective distribution of points around that individual point would correspondingly can very by the exact same magnitude in every direction.

Or in other words, each point is a point estimate of where that corresponding point on the ball lies, and the confidence interval contains 3.6 mm in every direction outward from that point. Would this give you 7.2 mm of possible variation/error?

Is this correct? Or are they suggesting that it is 1.8mm in either direction for a total variability of 3.6 mm?

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post #447 of 2138 (permalink) Old 06-09-2013, 11:08 AM
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Re: S.Q.T. (stupid question thread)

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post #448 of 2138 (permalink) Old 06-09-2013, 03:29 PM
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Re: S.Q.T. (stupid question thread)

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Originally Posted by GhostUnholy View Post
Can anyone explain to me exactly how Hawkeye's margin of error works. What I read by searching around was that they claim it has a 3.6 mm margin of error.

My understanding of this is as that if you took any discrete point within the distribution of the ball that they draw on the image it produces, that corresponding point of the ball could actually lie within 3.6mm along any vector drawn in any direction from that point. The collective distribution of points around that individual point would correspondingly can very by the exact same magnitude in every direction.

Or in other words, each point is a point estimate of where that corresponding point on the ball lies, and the confidence interval contains 3.6 mm in every direction outward from that point. Would this give you 7.2 mm of possible variation/error?

Is this correct? Or are they suggesting that it is 1.8mm in either direction for a total variability of 3.6 mm?
You answered your question here already in the bold part. The point showed on Hawkeye might be 3.6mm from the actual point where the ball landed. Not 1.8mm nor 7.2mm. In any direction.

I haven't done any research. There may be another factor there, the percentage of accuracy. That is, the bold part is correct in ninety something % of times, seldom 100%.
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post #449 of 2138 (permalink) Old 06-09-2013, 06:15 PM
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Re: S.Q.T. (stupid question thread)

Hey, thanks for your response.

I guess my confusion comes from the fact that if we choose any point X within the distribution they give us for the ball on a Hawkeye image, is the error such that the true position of that point could range from (X-1.8) to (X+1.8), or would it be (X-3.6) to (X+3.6) along a straight line through that point. I'm guessing that it's the first one, otherwise the margin of error simply seems too large. I think you're right also that it must be 90-something % of the time the point falls within that range, but I haven't seen a definitive number anywhere saying how the confidence interval is defined.

Unfortunately everything I found while looking around was just quotes from their rep saying that it had a 3.6mm error but no further explanation.

Another interesting point I noticed was that it says it the 3.6mm of error is in comparison to a high speed camera as the gold standard. It seems to me that it's a useful tool but far from infallible considering the tiny margins of some of the calls decided with it.

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post #450 of 2138 (permalink) Old 06-09-2013, 07:19 PM
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Re: S.Q.T. (stupid question thread)

Consider a tennis ball is about 6.7cm in diameter, a 3.6mm deviation is pretty close. Also, most of the time, the deviation will not be that high. Here's a typical statistic graph



So basically 95% of the time, the deviation is +/-2 and 68% of time the deviation is +/-1 and 99.7% of time, the deviation is +/-3

Usually when reporting the deviation, 95% is the norm.
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