Hi guys! I have prepared for you some statistics on how countries are performing against each other in Codeforces which I hope you will find interesting!
Top 5 countries with the most users with certain rank:
Top 5 countries with highest percentage of their users in a certain rank:
(Here I don't count countries that have less than 10 Codeforces users)
Newbie:
Pupil:
Specialist:
Expert:
Candidate Master:
Master:
International Master:
Grandmaster:
International Grandmaster:
Legendary grandmaster:
And some lists:
List of countries ordered by average rating:
(again users>=10)
- North Korea with average rating of 1835 and user count of 53
- Finland with average rating of 1751 and user count of 54
- Sweden with average rating of 1735 and user count of 59
- Poland with average rating of 1729 and user count of 503
- Switzerland with average rating of 1715 and user count of 53
- New Zealand with average rating of 1699 and user count of 19
- Slovakia with average rating of 1698 and user count of 84
- China with average rating of 1662 and user count of 7786
- Australia with average rating of 1659 and user count of 95
- Hungary with average rating of 1656 and user count of 58
- Japan with average rating of 1653 and user count of 997
- Taiwan with average rating of 1650 and user count of 482
- Latvia with average rating of 1649 and user count of 74
- Czechia with average rating of 1648 and user count of 115
- Canada with average rating of 1641 and user count of 228
- Croatia with average rating of 1633 and user count of 178
- Israel with average rating of 1630 and user count of 34
- Netherlands with average rating of 1629 and user count of 56
- South Korea with average rating of 1615 and user count of 694
- Iceland with average rating of 1614 and user count of 13
- South Africa with average rating of 1612 and user count of 23
- Argentina with average rating of 1612 and user count of 134
- Hong Kong with average rating of 1605 and user count of 164
- Thailand with average rating of 1603 and user count of 190
- Slovenia with average rating of 1602 and user count of 29
- Italy with average rating of 1599 and user count of 115
- Singapore with average rating of 1591 and user count of 88
- United States with average rating of 1590 and user count of 1067
- Denmark with average rating of 1583 and user count of 23
- Austria with average rating of 1582 and user count of 23
- Germany with average rating of 1578 and user count of 157
- France with average rating of 1575 and user count of 140
- Bulgaria with average rating of 1575 and user count of 185
- Norway with average rating of 1571 and user count of 30
- United Kingdom with average rating of 1567 and user count of 113
- Romania with average rating of 1565 and user count of 686
- Estonia with average rating of 1563 and user count of 41
- Spain with average rating of 1555 and user count of 103
- Philippines with average rating of 1553 and user count of 52
- Serbia with average rating of 1544 and user count of 175
- Turkey with average rating of 1533 and user count of 349
- Brazil with average rating of 1532 and user count of 766
- Belarus with average rating of 1532 and user count of 962
- Lebanon with average rating of 1526 and user count of 38
- Greece with average rating of 1525 and user count of 52
- Vietnam with average rating of 1524 and user count of 1512
- Belgium with average rating of 1523 and user count of 53
- Russia with average rating of 1516 and user count of 6225
- Ukraine with average rating of 1503 and user count of 1382
- Cyprus with average rating of 1500 and user count of 19
- Cuba with average rating of 1498 and user count of 194
- Macedonia with average rating of 1496 and user count of 70
- Mexico with average rating of 1488 and user count of 208
- Bosnia and Herzegovina with average rating of 1484 and user count of 27
- Portugal with average rating of 1483 and user count of 40
- Turkmenistan with average rating of 1479 and user count of 75
- Armenia with average rating of 1472 and user count of 155
- Iran with average rating of 1466 and user count of 1552
- Ireland with average rating of 1464 and user count of 32
- Zimbabwe with average rating of 1462 and user count of 11
- Mongolia with average rating of 1462 and user count of 127
- Lithuania with average rating of 1460 and user count of 120
- Moldova with average rating of 1459 and user count of 101
- Indonesia with average rating of 1459 and user count of 594
- Chile with average rating of 1459 and user count of 55
- Peru with average rating of 1452 and user count of 218
- Malaysia with average rating of 1448 and user count of 67
- Venezuela with average rating of 1438 and user count of 71
- Kyrgyzstan with average rating of 1434 and user count of 122
- Sri Lanka with average rating of 1430 and user count of 30
- Kazakhstan with average rating of 1423 and user count of 1031
- Georgia with average rating of 1417 and user count of 314
- India with average rating of 1408 and user count of 9103
- Tajikistan with average rating of 1398 and user count of 131
- Uzbekistan with average rating of 1392 and user count of 320
- Colombia with average rating of 1389 and user count of 229
- Syria with average rating of 1377 and user count of 392
- Azerbaijan with average rating of 1377 and user count of 114
- Pakistan with average rating of 1368 and user count of 19
- Nepal with average rating of 1358 and user count of 17
- Palestinian Territory with average rating of 1351 and user count of 17
- Morocco with average rating of 1341 and user count of 143
- Egypt with average rating of 1335 and user count of 1930
- Saudi Arabia with average rating of 1330 and user count of 29
- Jordan with average rating of 1321 and user count of 245
- Tunisia with average rating of 1319 and user count of 258
- Oman with average rating of 1317 and user count of 10
- Bolivia with average rating of 1317 and user count of 115
- Dominican Republic with average rating of 1304 and user count of 78
- Bangladesh with average rating of 1262 and user count of 3338
List of countries by Topcoder-like score
(users>=10)
- Russia with score of 2974
- China with score of 2931
- Japan with score of 2779
- South Korea with score of 2775
- Poland with score of 2738
- United States with score of 2679
- Belarus with score of 2655
- Ukraine with score of 2633
- Taiwan with score of 2523
- Romania with score of 2476
- Croatia with score of 2461
- Iran with score of 2458
- Canada with score of 2405
- India with score of 2399
- Vietnam with score of 2367
- Brazil with score of 2338
- Australia with score of 2338
- Indonesia with score of 2320
- Hong Kong with score of 2305
- Kazakhstan with score of 2290
- Switzerland with score of 2287
- North Korea with score of 2273
- Czechia with score of 2250
- Sweden with score of 2249
- Thailand with score of 2230
- Slovakia with score of 2225
- Argentina with score of 2224
- Finland with score of 2202
- Bangladesh with score of 2202
- Bulgaria with score of 2201
- Latvia with score of 2186
- Turkey with score of 2174
- Germany with score of 2174
- Egypt with score of 2173
- Singapore with score of 2150
- Serbia with score of 2138
- Armenia with score of 2124
- Italy with score of 2115
- France with score of 2110
- United Kingdom with score of 2107
- Lithuania with score of 2100
- Georgia with score of 2097
- Netherlands with score of 2085
- Uzbekistan with score of 2073
- Spain with score of 2072
- Syria with score of 2065
- Hungary with score of 2053
- Peru with score of 2049
- Cuba with score of 2037
- Mexico with score of 2016
- Moldova with score of 1988
- Philippines with score of 1969
- Belgium with score of 1967
- Jordan with score of 1960
- Kyrgyzstan with score of 1951
- Colombia with score of 1950
- Estonia with score of 1942
- Malaysia with score of 1925
- South Africa with score of 1904
- Tajikistan with score of 1903
- Israel with score of 1898
- Azerbaijan with score of 1888
- Slovenia with score of 1873
- Turkmenistan with score of 1872
- Macedonia with score of 1869
- Mongolia with score of 1858
- Greece with score of 1851
- Venezuela with score of 1838
- Austria with score of 1824
- Portugal with score of 1790
- Lebanon with score of 1775
- Iceland with score of 1775
- Denmark with score of 1757
- New Zealand with score of 1748
- Chile with score of 1737
- Bolivia with score of 1732
- Morocco with score of 1730
- Norway with score of 1724
- Tunisia with score of 1706
- Dominican Republic with score of 1696
- Bosnia and Herzegovina with score of 1678
- Sri Lanka with score of 1655
- Ireland with score of 1650
- Cyprus with score of 1618
- Zimbabwe with score of 1581
- Saudi Arabia with score of 1536
- Nepal with score of 1459
- Pakistan with score of 1449
- Palestinian Territory with score of 1429
- Oman with score of 1364
List of countries ordered by highest rated user
(users>=10)
- Belarus with highest rating of 3496 and user count of 962
- Russia with highest rating of 3298 and user count of 6225
- China with highest rating of 3294 and user count of 7786
- Switzerland with highest rating of 3218 and user count of 53
- Australia with highest rating of 3109 and user count of 95
- Japan with highest rating of 3106 and user count of 997
- Poland with highest rating of 3084 and user count of 503
- South Korea with highest rating of 3071 and user count of 694
- United States with highest rating of 3014 and user count of 1067
- South Africa with highest rating of 2941 and user count of 23
- Ukraine with highest rating of 2914 and user count of 1382
- Croatia with highest rating of 2851 and user count of 178
- Romania with highest rating of 2835 and user count of 686
- Sweden with highest rating of 2801 and user count of 59
- Slovakia with highest rating of 2749 and user count of 84
- Iran with highest rating of 2747 and user count of 1552
- Czechia with highest rating of 2732 and user count of 115
- Taiwan with highest rating of 2726 and user count of 482
- Canada with highest rating of 2698 and user count of 228
- Malaysia with highest rating of 2691 and user count of 67
- Lithuania with highest rating of 2689 and user count of 120
- Netherlands with highest rating of 2687 and user count of 56
- France with highest rating of 2684 and user count of 140
- Latvia with highest rating of 2671 and user count of 74
- Hong Kong with highest rating of 2655 and user count of 164
- Italy with highest rating of 2614 and user count of 115
- Brazil with highest rating of 2582 and user count of 766
- Armenia with highest rating of 2575 and user count of 155
- Finland with highest rating of 2551 and user count of 54
- India with highest rating of 2549 and user count of 9103
- Argentina with highest rating of 2543 and user count of 134
- North Korea with highest rating of 2502 and user count of 53
- Indonesia with highest rating of 2489 and user count of 594
- Kazakhstan with highest rating of 2471 and user count of 1031
- Moldova with highest rating of 2437 and user count of 101
- Bangladesh with highest rating of 2435 and user count of 3338
- Thailand with highest rating of 2434 and user count of 190
- Vietnam with highest rating of 2433 and user count of 1512
- United Kingdom with highest rating of 2429 and user count of 113
- Philippines with highest rating of 2421 and user count of 52
- Turkey with highest rating of 2410 and user count of 349
- Singapore with highest rating of 2400 and user count of 88
- Bulgaria with highest rating of 2384 and user count of 185
- Estonia with highest rating of 2379 and user count of 41
- Germany with highest rating of 2366 and user count of 157
- Cuba with highest rating of 2361 and user count of 194
- Belgium with highest rating of 2352 and user count of 53
- Spain with highest rating of 2327 and user count of 103
- Syria with highest rating of 2325 and user count of 392
- Uzbekistan with highest rating of 2323 and user count of 320
- Jordan with highest rating of 2305 and user count of 245
- Serbia with highest rating of 2286 and user count of 175
- Dominican Republic with highest rating of 2279 and user count of 78
- Egypt with highest rating of 2271 and user count of 1930
- Mexico with highest rating of 2248 and user count of 208
- Iceland with highest rating of 2242 and user count of 13
- Austria with highest rating of 2227 and user count of 23
- Hungary with highest rating of 2213 and user count of 58
- Peru with highest rating of 2210 and user count of 218
- Georgia with highest rating of 2206 and user count of 314
- Colombia with highest rating of 2200 and user count of 229
- Kyrgyzstan with highest rating of 2196 and user count of 122
- Slovenia with highest rating of 2188 and user count of 29
- Tajikistan with highest rating of 2147 and user count of 131
- Portugal with highest rating of 2110 and user count of 40
- Zimbabwe with highest rating of 2107 and user count of 11
- Venezuela with highest rating of 2103 and user count of 71
- Greece with highest rating of 2103 and user count of 52
- New Zealand with highest rating of 2092 and user count of 19
- Macedonia with highest rating of 2077 and user count of 70
- Sri Lanka with highest rating of 2073 and user count of 30
- Israel with highest rating of 2071 and user count of 34
- Turkmenistan with highest rating of 2038 and user count of 75
- Morocco with highest rating of 2029 and user count of 143
- Denmark with highest rating of 2029 and user count of 23
- Azerbaijan with highest rating of 2013 and user count of 114
- Mongolia with highest rating of 1993 and user count of 127
- Lebanon with highest rating of 1967 and user count of 38
- Cyprus with highest rating of 1966 and user count of 19
- Saudi Arabia with highest rating of 1958 and user count of 29
- Ireland with highest rating of 1947 and user count of 32
- Bolivia with highest rating of 1933 and user count of 115
- Chile with highest rating of 1911 and user count of 55
- Tunisia with highest rating of 1903 and user count of 258
- Norway with highest rating of 1849 and user count of 30
- Bosnia and Herzegovina with highest rating of 1846 and user count of 27
- Nepal with highest rating of 1703 and user count of 17
- Pakistan with highest rating of 1625 and user count of 19
- Palestinian Territory with highest rating of 1617 and user count of 17
- Oman with highest rating of 1465 and user count of 10
Interesting stats. My two cents:
Rating system explained: http://mirror.codeforces.com/blog/entry/20762
The rating system is not a logarithmic scale, it's a linear (or affine, to be precise) interval scale. The difference of ratings is what is meaningful, and the rating 0 doesn't have any specific meaning. Also the TopCoder page you link to explains just a weighted arithmetic mean.
So by becoming X times better you get + Y rating. Looks logarithmic to me.
I'm not following at all. Rating difference of 0 means 0.5 win probability, rating difference of 200 means 0.76 win probability, rating difference of 400 means 0.91 win probability, rating difference of 600 means 0.97 win probability. How's that "X times better, +Y rating"?
The intuition I have behind this is that as follows. Take two players A and B that have a rating difference of 200. The Elo system says that the stronger one will win in 76% of the cases. This means that his odds of winning are . We can thus say that A is (roughly) 3 times stronger than player B. Note that this is (or at least theoretically should be) the same on all levels, regardless of whether you are at 1600 or 2600. There are many different factors that may skew this property, such as rating floors, different multipliers (as it is in chess), or division boundaries, but let's assume that it is true.
Now, let's take two players change the rating difference to 400. This corresponds to probability of winning of 0.91, which equals to odds slightly over 10. A rating difference of 400 is the same as two differences of 200 and indeed we have 3.172 ≈ 10.
We have established that the odds of a player winning increases exponentially with his rating (it's not surprising when one looks at the formula). From a different perspective, player's rating is logarithmic with respect to his odds of winning.
Arguably the view I provided is somewhat arbitrary. It yields an important insight, though. Take two players A, B of strengths 2800 and 1200, and two players C and D of rating 2000 each to form two teams. Clearly the arithmetic mean is same for both, yet in many sports you would observe that team A + B has much better odds than C + D.
This is why I object against using arithmetic mean to compare countries strength. Its sheer amount of active coders places Russians on 48th place yet there are one of the strongest, if not the best.
Thanks for the comment! I've added a list with scores made with TopCoder's formula. I tried the second ranking a couple of times with slight variations but it didn't really bring any new information nor it turned out well for Czechia so I decided not to include it (oh and North Korea became first again). The first one on the contrary, gave a much more realistic result and I thank you very much for introducing me to it.
North Korea remains superior..
Am I the only one who finds it awesome that this post was created by Sorting?
Great post by the way! Congrats and thanks for all this useful data!