NGF numbers can be manipulated to say anything and I know of few "hands on" operators who put much stock in what NGF says. I am sure there are some really smart folks at NGF but.....
Here are two examples: One report from 2007 has the NGF revising its own numbers upward by 20% from 12.5 Million to 15 million! If you stick with there original 12.5 million core golfer number you have a 7% drop in core golfers compared to 2003--not a time when golf was booming and a pretty significant drop when adjusted for overall population gains! Or, take the new number (15M) and core golfers are up from 2003 by 12%! Which is it???
Also, how many operators would consider a "core golfer" someone who averages less than one round of golf a month? More of my thoughts FWIW to come
NUMBER OF CORE GOLFERS HIGHER THAN PREVIOUSLY REPORTED
ACCORDING TO NEW NGF GOLF RESEARCH
[MAY 9, 2007]- - According to a new national study of golf participation in the U.S., the number of Core golfers (adults age 18+ who play eight or more rounds a year) is higher than previously reported. The Core golfer number is estimated to be 15.0 million as compared to a figure of 12.5 million published by NGF a year ago.
The study also found that the number of junior golfers increased between 2005 and 2006, from 4.4 million to 4.8 million kids ages 6 to 17. The overall number of golfers for 2006, counting anyone age 6 and above who played at least one round of golf during the year, is estimated at 28.7 million, down 2.0% from the prior year.
CORE GOLFER NUMBER DIPS IN 2004
[June 6, 2005] -- Based on NGF’s recent annual sounding of golf participation, the total number of adult golfers dropped 3.9 percent, from 28.4 million in 2003 to 27.3 million in 2004. The number of Core golfers – those playing at least eight annual rounds – was 12.8 million in 2004. That’s 4.7% lower than the 13.4 million recorded in 2003.
Trend in Adult Golfers
Other than 1997 to 2000 (Tiger effect?), the number of Core golfers, those playing eight or more rounds per year, has been relatively stable over the past 15 years.
"The number of Core golfers has been essentially flat for the past four years," says NGF president Joe Beditz. "Given the statistical margin of error around these numbers, we don’t put too much emphasis on one-year variations in participation. What we can say is that the number of Core golfers is more than it was 10 years ago, but less than five years ago."
NGF focuses on Core golfers because, while they represent 47 percent of total golfers, they account for 91 percent of rounds played and 87 percent of golf-related spending. The number of junior golfers ages 12-17 increased from 2.5 million in 2003 to 2.9 million in 2004. And the number of total golfers ages 12 and above dropped from 30.9 to 30.2 million.