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lol I mean I like that they apply a relatively consistent, objective measure, but it clearly has it's holes.
The system gave Canelo far too much credit for wins over washed up Mosley and blown up Josesito Lopez. Trout was a good win of course though. #4 P4P is funny.Last edited by BrometheusBob.; 08-12-2015, 10:42 PM.Comment
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lol at canelo being top p4pComment
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Yeah to follow up on that, BoxRec punishes inactivity badly. In some cases that makes sense, for example Hector Camacho's score didn't go up at all for beating SRL because the latter had his score tanked almost entirely for his several years of inactivity. In this case, Ward being out for over 1.5 years cost him more than half of his rating (before then, his score was just shy of what Klitschko's is now).Comment
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It's always bad but I don't understand how people can be a member of this site for so long and still not know it's computer generated. These threads pop up every couple months and it's always discussed in various threads.
From there website:
BoxRec.com provides Active and All Time boxer ratings, as calculated daily by its computer. These ratings are not influenced by subjective views or opinions but are wholly dependent upon the bouts contained in the BoxRec database.
So there is no point debating or questioning their list since its generated by a computer which is based off whatever criteria they have set. P4P lists are subjective which is why their computer based system results in some whacky results.Comment
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Isn't it computer generated.
Edit: yea what he said ^ lolComment
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Take your pick of any 10 fighters who have fought at least once in the past 20 months against ranked opposition in their own rated weight class.
I am also fine with Rigo not being on the list. If you do not fight, you do not make the list and Rigo with only 15 fights is borderline at the best of times.Comment
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http://boxrec.com/media/index.php/Bo...gs_Description
u guys shudve read that firstBoxRec.com provides Active and All Time boxer ratings, as calculated daily by its computer. These ratings are not influenced by subjective views or opinions but are wholly dependent upon the bouts contained in the BoxRec database.
Current ("Active") Rating
Every boxer gets a first rating of 0 before his first bout.
After every bout, the ratings of the two boxers involved are changed depending on the bout's official result (KO, TKO, RTD, UD, PTS, NWS, MD, SD, DQ, TD, DRAW).
The value of a result varies between v=1 and v=0.
The clear decision factor varies between cd=1 and cd=0.
The winner cannot lose points for KO, TKO, RTD, DQ, TD and decisions on points with cd=1
KO, TKO, RTD are rewarded with full value v=1, cd=1.
NWS is rewarded with full value v=1 for 12 rounds boxed and more and a lower value related to the number of rounds boxed. Clear decision factor cd=1.
UD, PTS are rewarded with full value v=1 for 12 rounds boxed and more and a lower value related to the number of rounds boxed, clear decision factor cd=1. This is valid, if the score cards are not available.
DRAW is rewarded with full value v=1 for 12 rounds boxed and more and a lower value related to the number of rounds boxed. Clear decision factor cd=0.
MD, SD, DQ, TD are rewarded with full value v=1 for 12 rounds boxed and more and a lower value related to the number of rounds boxed. Clear decision factor cd=0.5. This is valid, if the score cards are not available.
If the score cards are available, the value rewarded is in direct proportion to the rounds boxed, with full value v=1 for 12 rounds boxed and more. The clear decision factor is in proportion to rounds boxed and the mean score difference per judge. cd=1 for a mean score difference per judge of 50% of the rounds boxed.
All bouts are regarded to have the same weight independent of titles.
The winner gets a certain part of the opponent's points and a certain part of the rating difference to the opponent's rating.
For a DRAW the rating of the higher rated boxer is reduced by some part of the point difference; the rating of the lower rated boxer is enhanced by the same amount of points.
The full relative point reward is 33%. It is in direct proportion to the pre-bout rating of the defeated opponent.
The winner can get up to 25 additional points per opponent's launch state rank
The maximum launch state rank regarded is 15 - and so the maximum number of additional points is 375
This value is reduced by the own rating, and it is set in direct proportion to the rounds boxed and the clearness of the decision
This value is multipied by the maximum of 6 * the opponent's launch state+1 and the minimum of the opponent's rating and 25 * the opponent's launch state
This value is divided by 25 * the opponent's launch state
This value is multiplied by the quotient of the maximum of the opponent rating and 18 on one side and the sum of the maxima of the opponent rating and 18 and the maxima of the own rating and 18
Launch states are:
0 = no recent win
1 = 1 recent win, 2 = 2 recent wins, 3 = 3 recent wins
4 = recent win over opponent with state 3, 5 = 2 recent wins over opponent with state 3, 6 = 3 recent wins over opponent with state 3
7 = recent win over opponent with state 6, 8 = 2 recent wins over opponent with state 6, 9 = 3 recent wins over opponent with state 6
10 = recent win over opponent with state 9, 11 = 2 recent wins over opponent with state 9, 12 = 3 recent wins over opponent with state 9
13 = recent win over opponent with state 12, 14 = 2 recent wins over opponent with state 12, 15 = 3 recent wins over opponent with state 12
The ratings are decreased for moving up to higher weight divisions by the square of the reciprocal ratio of the weights limits of the divisions--and they are increased by the same factor for moving down the divisions.
The rating of a boxer is reduced by 0% to 50%, if he didn't box an opponent with a rating of at least 50% to 0% of his own rating points within 18 months.
The rating of a boxer is reduced by 50% for every time period of inactivity of 18 months.
The pre-bout rating of a boxer successfully returning from inactivity is set to the lower value of his own rating before inactivity and the higher value of his own rating after inactivity and the pre-bout rating of his opponent.
The pre-bout rating of a successfully debuting boxer is set to 25% of his opponents pre-bout rating.
Formula
If a boxer with a rating of r_a before the fight defeats a boxer b with a rating of r_b before the fight with result of value v and clear decision factor cd, the new ratings r_a_new and r_b_new after a fight are, earn_f is 33.3%:
earn = earn_f * v * (r_b*cd + (r_b-r_a)/(1+2*cd));
r_a_new = r_a + earn
r_b_new = r_b - earn
Additional points (no additional loss points accounted):
opponent in launch state n: v * cd * (25*n - r_a) * max(6*(n+1),min(r_b,25*n)) / (25*n) * max(r_a,18) / (max(r_a,18) + max(r_b,18))
Rating reduction caused by missing opponent quality:
r_new = r_old * (1 - 0.5*(1 - best_opp/r_old/0.5))
Examples
Boxer a KO boxer b, a has 1000 points, b has 500 points. launch state 4, v=1, cd=1,
earn= 0.33 * 1 * (500*1 + (500-1000)/(1+2*1)) = 111
r_a_new = 1000 + 111 = 1111
r_b_new = 500 - 111 = 389
Boxer a UD 6 boxer b, scores 59:55 58:56 58:56, a has 1000 points, b has 500 points.
A 6 rounder is rewarded with value 6/12, v=0.5
UD is rewarded with cd=1 at maximum
mean score difference per judge is (4+2+2)/3 = 2.667, which is rewarded in direct proportion to half the rounds boxed with cd= 2.667/3 = 0.89 at maximum
so cd=0.89
earn= 0.33 * 0.5 * (500*0.89 + (500-1000)/(1+2*0.89)) = 44
r_a_new = 1000 + 44 = 1044
r_b_new = 500 - 44 = 456
Boxer a SD 4 boxer b, scores 39:37 39:37 37:39, a has 1000 points, b has 500 points
A 4 rounder is rewarded with 4/12, v=0.333
SD is rewarded with cd=0.5 at maximum
mean score difference per judge is (2+2-2)/3 = 0.667, which is rewarded in direct proportion to half the rounds boxed 0.667/2 at maximum\
so cd=0.333
earn= 0.33 * 0.33 * (500*0.33 + (500-1000)/(1+2*0.33)) = -15
r_a_new = 1000 - 15 = 985
r_b_new = 500 + 15 = 515
More complex - Boxer a KO 4 boxer b, a has 30 points, b has 40 points, boxer b is in launch state 3, v=1, cd=1
earn= 0.33 * 1 * (40*1 + (40-30)/(1+2*1)) = 14
r_a_new = 30 + 14 = 44
r_b_new = 40 - 19 = 21
additional points:
1 * 1 * (3*25 - 30) * max(6*4,min(40,3*25)) / 75 * 30 / (30+40)= 1 * 45 * 40 / 75 * 3 / 7 = 10
r_a_new = 44 + 10 = 54
All Time ("Inactive") Ratings
The All Time Rating for a boxer is the sum of 33% of the sum of annual rank points he gets for his annual ratings - and 33% of the sum of annual rank points of best defeated opponents - and 14% of his career top rating:
the annual rating is the rating at the end of every year the boxer was active
annual rank points = 200 / annual rank in division cluster
the value of 200 annual points for the top boxer is reduced, if the annual rating of #10 in the division cluster is less than 100 for men, - and if the annual rating of #5 in the division cluster is less than 50 for women
Bout Star Ratings
All bouts are rated with 0 to 5 stars.
Men
5 stars = both opponents have 331 ratings points at least ~ best 100 boxers
4 stars = both opponents have 188 ratings points at least ~ best 300 boxers
3 stars = both opponents have 83 ratings points at least ~ best 900 boxers
2 stars = both opponents have 24 ratings points at least ~ best 2700 boxers
1 stars = both opponents have 1 rating point at least = rated boxers
0 stars = one opponents has not even 1 rating point at least = not rated boxers
Women
5 stars = both opponents have 42 ratings points at least ~ best 30 boxers
4 stars = both opponents have 28 ratings points at least ~ best 60 boxers
3 stars = both opponents have 14 ratings points at least ~ best 120 boxers
2 stars = both opponents have 4 ratings points at least ~ best 240 boxers
1 stars = both opponents have 1 rating point at least = rated boxers
0 stars = one opponents has not even 1 rating point at least = not rated boxersComment
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