Originally posted by techsouthThe 1994 USCF distribution chart in Glickman's paper did remove players who hadn't played at least one rated game in the previous 6 months. (The total number of players in the chart was around 21,300, which was much less than the total membership at the time.)
Indeed, it does not seem to hold on USCF data. Although at the very highest range it does seem to be close. I wonder if they removed all players who have not played in the last 6 months where this distribution would be.
Ranking PlayersAbove
=================
2500 160
2400 293
2300 540
2200 1241
2100 2073
2000 ...[text shortened]...
(I didn't pull out scholastic players, but there numbers are insignificant at these levels).
But the 2002 USCF distribution chart on the USCF web site appears to list all players that have a rating, since the total number of players in the 2002 chart is 69,119. The May, 2002 total membership was 89,282. (I don't have the number for the 1994 total membership. I don't think the USCF has grown much since 1994; It might have even shrunk since then.) I can't imagine that the person creating the chart would remove inactive players at the highest ranges and not do that for all of the other ranges.
And if you look at the meaty part of the distribution curve for both 1994 and 2002, the reduction in better players for a 100 point increase seems to be in the range of 80 to 90 percent for both curves. So my guess is that the effect of inactive versus active players doesn't change the numbers much.
Thank you all for posting in response to this question- I am now much better informed, though none the wiser. A couple of questions: (a) what does a Gaussian curve look like?
(b)Is he the Gauss responsible for Gauss' law of competitive exclusion which has wide application to ecology?
(c)How does Gauss' line differ from a bell curve, or is that just a different name for the same thing?
Thanks again!
Originally posted by Anthony Patondon't know about the competitive exclusion, but bell curve is a nickname for gaussian aka. the normal distribution.
Thank you all for posting in response to this question- I am now much better informed, though none the wiser. A couple of questions: (a) what does a Gaussian curve look like?
(b)Is he the Gauss responsible for Gauss' law of competitive exclusion which has wide application to ecology?
(c)How does Gauss' line differ from a bell curve, or is that just a different name for the same thing?
Thanks again!
a little googling told me that the competitive exclusion is gause's law, not gauss'...