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Strokes Gained Putting

post #1 of 9
Thread Starter 

How could Tiger have 1 putted the first green today and LOST a fraction of a stroke in this category?  Is it because of some sort of adjustment they use?  Seems weird in that it is not possible to do better than a 1 putt (as a chip in should not affect this stat)

 

 

STATISTICS

  ROUND 1 ROUND 2 ROUND 3 TOTAL RANK*
EAGLES -- -- -- 0 N/A
BIRDIES 4 7 -- 11 T13
PARS 13 11 1 25 T66
BOGEYS 1 -- -- 1 75
DOUBLE BOGEYS -- -- -- 0 N/A
OTHER -- -- -- 0 N/A
DRIVING ACCURACY 64 71 0 65.5 T30
DRIVING DISTANCE 276.0 306.0 -- 291.0 12
STROKES GAINED - PUTTING 0.487 2.911 -0.008 1.649 T12
PUTTS PER ROUND 32 30 1 21.0 T7
PUTTS PER GIR 2.000 1.706 -- 1.839 53
GREENS IN REG 78 94 0 83.8 3
SAND SAVES 100 -- -- 100.0 T1
*Ranks are computed at the end of each round.

http://www.pgatour.com/golfers/008793/tiger-woods/scorecards/#!/r009/2012

post #2 of 9

It looks like a math quirk. He lost 8 one thousandths of a stroke. So basically 0.

 

That's all I can figure.

 

P.S. Maybe because he putted from the fringe? Though I don't understand how that would change things.

post #3 of 9
Strokes gained is not about how many putts you make, it's about how you compare with the field from the same distance. So if Tiger makes a one-footer, he's probably not going to pick up any strokes from the field on that.

As for why he lost a tiny fraction, it's probably just a rounding error. If a lot of guys have already finished their round, and he's only played one hole, and the overall average for the field has to come out to zero, then guys who have played fewer holes are going to have slightly inaccurate numbers. I'm surprised they even report that stat for a player who hasn't completed his round.
post #4 of 9

Can someone explain to me what this stat is?  Or how it is calculated?  I'm going to do Aimpoint this weekend, and I know this is a stat that the Aimpointers like to discuss.  So figured I should understand what it is before I go to this clinic.

post #5 of 9

http://www.pgatour.com/r/strokes-gained-putting-questions/index.html

 

 

 

 

Quote:

How is the new statistic computed?

First, the average number of putts a TOUR player is expected to take is calculated from every distance, based on ShotLink data from the previous season. The actual number of putts taken by a player are subtracted from this average value to determine strokes gained or lost.

For example, the average number of putts used to hole out from 7 feet, 10 inches is 1.5. If a player one-putts from this distance, he gains 0.5 strokes (1.5 - 1). If he two-putts, he loses 0.5 strokes (1.5 - 2). If he three-putts, he loses 1.5 strokes (1.5 - 3).

For the final statistic, a player's strokes gained or lost putting is compared to the field. For example, if a player gained a total of three strokes over the course of a round and the field gained an average of one stroke, the player's "Strokes Gained Against the Field" would be two.

 

 

Quote:
Originally Posted by Beachcomber View Post

Can someone explain to me what this stat is?  Or how it is calculated?  I'm going to do Aimpoint this weekend, and I know this is a stat that the Aimpointers like to discuss.  So figured I should understand what it is before I go to this clinic.

post #6 of 9

x129.  Thanks for the response.  So Strokes Gained Putting is taking Shotlink data from the previous year.  Is that on all courses?  Or just the data for that particular course/tournament, that particular week?

post #7 of 9

My understanding is that that they take last years values (all courses).   They also do strokes gained against the field (strokes gained- strokes gained on average by the field).

Quote:
Originally Posted by Beachcomber View Post

x129.  Thanks for the response.  So Strokes Gained Putting is taking Shotlink data from the previous year.  Is that on all courses?  Or just the data for that particular course/tournament, that particular week?

post #8 of 9
Anyone know how we can easily calculate our own "Strokes Gained"? I'm not sure what I'd want my baseline to be- others with similar handicaps? Pros? Either way, as long as it's consistent I suppose.


http://strokesgainedcalc.com/strokes-gained-calculator/

Found this link but I'm on my phone. Will have to review when I get home.
post #9 of 9
Thread Starter 
I just plugged my last round into the calculator you provided- I think it is pretty good, but there are limitations.  
 
The least accurate, IMO, is the Recovery category.  Certain recovery shots are much easier than others, so it is hard to come up with an expected PRO shot total just based on distance.  
 
Things like wind, uphill/downhill, altitude, green speed, pin location, green quality, lie in the bunker, amount of tree interference, forced lay-ups etc. are also not factored in, so keep this in mind.  

 

Here is what they say regarding limitations:

 

With all that being said, there are a few location specific limitations that I would like to address so that you don’t run into any big problems.

Tee Shots(t)- There is no data available for holes <100* yards or >600* yards, so keep your tee shot distance #’s in that range.

Fairway(f), Rough(r), and Sand(s)- There is no data available for shots <10* yards from any of these locations.

Recovery(x)- These are shots where you are in serious trouble and either have to hit a miracle shot or pitch out. There is no data available for shots <81* yards from this location.

Green(g)- Remember, this is the only surface where distances are measured in FEET, not yards. The green is also the surface where recording as accurate of a measurement as possible is very important, especially inside 20 feet where 2-3 feet can make a relatively large difference. Always use whole number(no decimals) and the range of data available is 1* foot up to 100* feet.

*If you put in a distance from a location and there is no data available, the calculator will put a “0″ in the PGA Strokes column and your results will be skewed incorrectly. Just do the best you can to make sure all your starting distances/locations have data associated with them. If you have a 5 yard pitch shot from the Rough(r) you are just going to have to put 10 yards in the calculator. If you have a Recovery(x) shot from 50 yards you are just going to have to put in 81 yards in the calculator. 

 

It appears there is at least one bug in the program in how it handled a 270 yard tee shot for me.  On the total above, it had my score correct at 76 which it said was 8.76 worse than the ave PGA Tour Pro who would shoot 67.24.  However, on the various yardage categories, it appears to have double counted the 270 tee shot in both the Tee Shot category and the 226+ category and come up with a total of my round being 11.06 worse. 

STROKES GAINED CALCULATOR V1.3                                
T F R S       X G   Course Score TOT STK              
Tee Fairway Rough Sand       Recovery Green   67.24 76 -8.76              
                      PUTTING                
TEE SHOTS 226+yds 176-225yds 126-175yds     50-125yds 31-50 yds 10-30 yds BUNKER OVER15 5 TO 15 UNDER5       RECOVERY TOTAL
-4.42 -2.06 -1.07 -0.23       0.2 -0.88 0.06 -0.05 -1.57 -0.15 -0.81       -0.09   -11.06
TEE SHOTS -4.42 APPROACHES       -3.16 SHORT GAME -0.87 PUTTING   -2.53            

 

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