C:\htdocs\Personal Chess Training\statistics.html
I compiled a list of rhp site player statistics. You may find a current copy at the above we address. I'll try to keep it current. I can't put the script on-line because it takes several minutes to execute.
The arithematic mean is 1320 with a standard deviation of 236. 1303 is middle of the road while 1209 is the most common rating in frequency.
From the Z-Scores we can tell that most players range between 1000 and 1600. 2000 is 2.89 standard deviations from the mean and 2400 has a Z-Score of 4.58 Players above 2400 are 0.02 percent; that's not 2 percent, but 2 hundredths of one percent.
STATISTIC VALUE
N 19374
Mean 1,320
Standard Deviation 236
Median 1,303
Mode 1,209
Mean Absolute Deviation 184
RATING RANGE FREQUENCY PERCENT
2400 2600 3 0.02 %
2200 2400 30 0.15 %
2000 2200 139 0.72 %
1800 2000 439 2.27 %
1600 1800 1,592 8.22 %
1400 1600 4,214 21.75 %
1200 1400 6,776 34.97 %
1000 1200 4,744 24.49 %
800 1000 1,334 6.89 %
600 800 0 0.00 %
RATING Z-SCORE
2400 4.58
2200 3.73
2000 2.89
1800 2.04
1600 1.19
1400 0.34
1200 -0.51
1000 -1.36
800 -2.20
600 -3.05
Originally posted by petrovitchat the end the amount of good players here is very small, isnt it ?
C:\htdocs\Personal Chess Training\statistics.html
I compiled a list of rhp site player statistics. You may find a current copy at the above we address. I'll try to keep it current. I can't put the script on-line because it takes several minutes to execute.
The arithematic mean is 1320 with a standard deviation of 236. 1303 is middle of the roa ...[text shortened]... 2.04
1600 1.19
1400 0.34
1200 -0.51
1000 -1.36
800 -2.20
600 -3.05
I left the web address off:
www.personalchesstraining.com/statistics.html
I'll add bar charts and stuff to it later today. If there are any other statistics you would like to see then please ask. The script has to read about 700 web pages to extract the information so it takes a long time to run. That's why I can't put the script on-line as some of you has asked.
I stated there was no correlation between a player's rating and the number of games played. I guess I'd better back that up with evidence. Remember, these figures are real-time so while the mean, standard deviation, etc. should remain very close they may vary from one examination to another. So this mean may be slightly different from previous means examined in other threads. It changes with every game played on this site.
N MEAN STD R R2 INTERCEPT SLOPE
19,392 1,320 236 0.0710 0.0050 1,311.4071 0.0362
This simple linear regression shows that the equation of the straight line is:
Rating := 1311 + 0.0362 * Number of Games
So the slope show that your rating will increase by 0.04 points for every game you play, but these figures are not reliable. The correlation between a player's rating and the number of games played is 0.07 It needs to be 10 times that much to be significant. And the coefficient of determination, r2, is only 0.0050 meaning that only 1/2 of one percent of the variation between mean and the realtionship of these two numbers can be explained. So, while the number of books read, number of hours studied, etc. may tell us something, the number of games played tells us absolutely nothing about a player's rating or the acceleration of his rating.
Originally posted by SquelchbelchI'm not sure I can answer that. I'm just reading every rating listed on every web page in the player tables. These ratings must be non-zero numbers for me to calculate. Maybe there are zero values in the player tables for unrated players. I'll check into it, but here's what I am doing ... there are about 647 pages so I'm reading more pages than is necessary. I could clean the code up some, but it's not something I'll run everyday so a frist draft is okay with me.
Excellent stuff but where did you get the 19,374 players from?
For instance, nearly 23,000 players have moved in the last 12 days:
http://www.playtheimmortalgame.com/core/playertable.php?col=8&state=asc&page=761
/* Read all web pages with ratings into buffer */
for ($i = 1; $i < 700; $i++)
{
$buffer .= file_get_contents( "http://www.timeforchess.com/core/playertable.php?page=$i" ) ;
}
/* Put ratings into an array */
$pattern = '/(\d+).*?tr>/mi';
if (preg_match_all($pattern, $buffer, $matches, PREG_PATTERN_ORDER)) ...
And regardless of the size of n I think the correlation is evidence enough to support my claim that there is no significant relationship between a player's rating and the number of games he/she has played. Any possible relationship would be positive. That's all.
Its interesting to note than 1/3 of players are 1200-1400, 1/3 below 1200 and only 1/3 above 1400. I was wondering if this is an indication of chess playing strength at large or if it supports the fact that the internet is attracting and increasing number of inexperienced younger players unlike OTB where average age must now be 50+ although I would have placed the average strength of my (OTB) club at 1700 and the average strength of the (OTB) league in which I play in the region of 1900.
Originally posted by Dragon FireWell, maybe we can fetch the ratings from USCF. I don't know about any other organizations. Are the ratings from any other courntries, or FIDE online? The extraction is quick and easy if they are on-line in public access.
Its interesting to note than 1/3 of players are 1200-1400, 1/3 below 1200 and [b]only 1/3 above 1400. I was wondering if this is an indication of chess playing strength at large or if it supports the fact that the internet is attracting and increasing number of inexperienced younger players unlike OTB where average age must now be 50+ although I woul ...[text shortened]... club at 1700 and the average strength of the (OTB) league in which I play in the region of 1900.[/b]
Originally posted by WulebgrAs most clubs around here are doing well if they have a dozen members hald a dozen 1700s or above would give a mean around 1700. Of course we only have 100000 people or so so getting more than 10 OTB chess players is quite good.
At 1700 USCF, I'm in the top half-dozen at my club in a metropolitan area of 1/2 million people.