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Here is a link that addresses a few of these questions Tom.
http://www.pgatour.com/r/stats/2007/101.html You can select the driving statistics back to 1980.
Also, to quote the measurement parameters from the site:
"The average number of yards per measured drive. These drives are measured on two holes per round. Care is taken to select two holes which face in opposite directions to counteract the effect of wind. Drives are measured to the point at which they come to rest regardless of whether they are in the fairway or not." Now what it doesn't tell you is whether the two measurement holes each tournament are wide open par 5's or tight little par 4's. I'm quite certain that many players use clubs other than the driver on the measurement holes from time to time.
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Bruce - I don't think that is correct. Yes, back to 1980 you have stats measured on two holes per round. But the data they have since Shotlink was introduced is far more comprehensive, because they are measuring every shot. Steve was very clear about that in his presentation, although as Tom says, it could still hide bits. His data relating to average players was fascinating too: one of the points he made is that since the big drivers are so much easier to hit, more players are hitting driver more of the time.
Adam
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Adam- I may have missed your point as to which part of this arguement is incorrect. I understand that shotlink provides compreshensive data on every shot played on tour but the statistical analysis of driving distance on the PGA Tour website from 1980 through 2007 was consistant and compiled in accordance with the procedure in bold face above.
That said, Dr. Otto maintains that the "average" driving distance on the PGA Tour has remained constant at 287 yards. By average does he mean the "mean" driving distance. By the Tour's analysis in 2007 there were 110 players averaging MORE than 287 yards! In the year 2000 there were only 7. In 2000 only 1 player averaged over 300 yards, John Daly at 301.4. In 2007 there were 18 players averaging more than 300 yards. I suspect there are more in 2010.
I think Harrison Frazar's statistics are very telling: in 2,000 he was ranked 7th in driving distance at today's Tour average of 287.3 yards. In 2007 he was ranked 9th in driving at 302.8 yards.
To paraphrase Disraeli "....lies, damn lies and statistics". Dr Otto needs to look at the statistics.