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本帖最后由 凯利之王 于 2009-7-13 09:48 编辑
' ?0 j; L" g, _; O/ D4 E$ }8 Y* f/ a/ y4 p# R- a1 ^9 v! c9 `" {% S# U, y6 T' i) M
凯利指数的计算方法: ( O1 m2 a L3 d; F& D k- z3 I4 N8 @2 E
( a! s$ {. M5 W9 f4 Q
G3=S*S',G1=B*B',G0=F*F';(S:胜赔,B:平赔,F:负赔,S'欧平均胜率,B'欧平均平率,F'欧平均负率). ^( P5 N% g. y" a; b
什么?对于一家特定的公司,它的主胜的凯利指数G3=S*S'!你选择的公司样本不同,G值就不同,样本大小不同,G值也不同(一般的欧均值都取99家公司,从统计学的意义上来讲,还称不上样本!)这个G带有随意性,大个0.05小个0.08之类的,也只能算做误差,现在要我比较G与0.89哪个大?我大你个0.05怎么了?我小你个0.08又有什么干系? H% P+ \' B9 l U8 T. [
+ B6 S; ]- H1 H6 Y7 b/ N% ]/ v# O6 _+ a
& t" ]0 @) w! L( u* H% h C* q0 S; ]8 p) i
既然涉及到平均胜率,那么看一下胜率是怎么求出来的:平均主胜率S'=(S1'+S2'+….Sn')/n,S1'是第一家公司的主胜率,S2'是第二家公司的主胜率,以此类推。主胜率S'=r/S(r:赔付率)。赔付率(返还率)又是这样求的:r=1/(1/S+1/B+1/F),什么??又做梦了!!返还率是庄家也要到裁判终场哨响才知道的,这样也行??AC米兰踢亚特兰大,哨响了,投注比固定了,但踢出3,这场返还率可能是150%,踢出1可能是20%,踢出0,可能是5%,结果不同,返还率也不同啊!这里也可以看到,博彩公司不喜欢操控比赛,因为他想操控的只能是这种强弱分明的比赛,但强队踢假球的成本更高,它想操控也操控不了,最好的选择就是烧烧香:天哪,爆个冷吧! 4 W: j1 C9 d7 c5 W! c
7 e6 Z/ _5 C5 S: K8 T8 s
# V0 _" M/ z) |做下算术了: 2 i( y$ \ W: ~: {8 \" `7 ^; a5 t4 d- g9 a/ H- P" U
; ~' L. y! k5 F, M& W+ d
% G3 _; T) S9 z* {0 U1 k4 ~(1)SSP: 2.22 3.15 3.01 : `4 u/ N9 a2 y W3 e8 }9 n
" X7 s- ~. y) c. m
( z4 T }0 g0 T+ n* D(2)立博: 2.10 3.25 3.00
6 K+ Y$ u6 L1 W% U# r. j- M' Y T4 y" y. Y5 A
(3)威廉: 2.20 3.10 2.87 : D' ~# K. v* J, ^* k$ [ t; U; m ^3 j- N' u, `
/ w, J+ g2 f& u. i% @5 G(4)易胜博:2.25 3.10 2.95
5 z! Y/ B' N3 Q, J$ ^1 S& x- U+ {+ l. `) m% ~. _5 D- F1 I2 w9 U% b
我们假设就取这四家公司为某场比赛开出的赔率来计算凯利值
2 j* y+ S* \9 @. I! M: X' B5 F8 F, p$ }' ]( i% c
+ _% ^7 K* p$ W/ l- eS1=2.22 B1=3.15 F1=3.01
- |1 |4 M( d/ S7 n. g D5 N7 M5 x9 f7 v1 F
S2=2.10 B2=3.25 F2=3.00
5 V: q, s, e. f9 w% ^# T/ X4 W2 j% ] s
/ \7 c0 i+ t) Z9 {4 xS3=2.20 B3=3.10 F3=2.87
& J7 Z" [. @4 }, ^6 @) Z9 A' e& q. H7 B1 c9 S5 j, y5 y" ~# ?0 J2 {7 P) n
S4=2.25 B14=3.10 F4=2.95 ! ~0 p7 C' v# @. v; y G+ \
% H% r! k" O' Y% n Z2 s8 j8 w( d5 ` _0 H- N/ h7 V4 v
. V: [- i" u3 i% g* A# D9 A7 S% W1/r1=1/S1+1/B1+1/F1=1/2.22+1/3.15+1/3.01 => r1=0.91
6 a; k! a, T g9 q1 r4 z+ p, `! O1 b, R- R% J6 x9 z& M: S- Y7 ~
1/r2=1/S2+1/B2+1/F2=1/2.10+1/3.25+1/3.00 => r2=0.90 # t0 ?( P e* X% l
( ^* I' I6 J# h+ H, Q( d C+ D- r" v6 `4 H$ V: z! B
1/r3=1/S3+1/B3+1/F3=1/2.20+1/3.10+1/2.87 => r3=0.89 % h8 r* k9 }8 X/ Q5 J' q; s! }" ^3 D7 H& `( l% ?% r f. `
9 \. w5 L& K* H- ^0 _& x
1/r4=1/S4+1/B4+1/F4=1/2.25+1/3.10+1/2.95 => r4=0.90
! I! c( g; l" B1 }! H' ^& F( Z: G+ x9 Y- y- K6 r
2 a6 g7 O' `) e- C* s7 C5 F; P/ bS1'=1/(S1*r1)=1/(2.22*0.91)=41 : W# q# m$ g# T2 S, f, Q- k& _+ @! B" ]% h, t' e
" \" l$ S0 D3 W$ x类似的计算后,于是: # s3 M- z! s6 q8 s- Z8 M j" Y- Z2 g' h" I8 p* u2 t+ ]6 z/ f
\1 p8 s5 ^+ u' N5 c( R0 rS1'=41 B1'=29 F1'=30; n* A& |) W% C1 m
V2 R) }2 B3 g, D; I, i% z
S2'=43 B2'=28 F2'=30 3 e- T: x' @% _% l" w5 s
# K1 L" Q+ i6 H- r! b. A2 c, o' q; m' V% T, u, P% O# f1 Z8 S# f8 Q& b1 r. _6 Z
S3'=40 B3'=29 F3'=31 ( G" R4 F$ M% e( C# Z7 Q
6 z5 K/ n5 u, C9 L, h+ }+ O/ i% a, o- T; i# K% R1 V. w
S4'=40 B4'=29 F4'=31
, F4 t) Q3 |3 D5 t ~: B6 y" Y' M2 }4 T/ O0 g4 ~
; e) _. s# g) s; a- E1 ]( b' d(注意:3,4两家公司,赔率不同,但它们的胜,平,负率相同了) 8 [+ b0 b& X# U( [. o
; Z. t. P9 ^" m* N n* R9 Y/ Q" p9 \
( W2 I. G2 B, d+ ?好:S'=(S1'+S2'+S3'+S4')/4=(41+43+40+40)/4=41 # C, w1 Y; f7 K! s' d1 g
) q( ], k9 L T& t0 H" B. I y, v0 } @
B'=(B1'+B2'+B3'+B4')/4=(29+28+29+29)/4=28.75 4 Q+ d' g" P9 E5 G) R
' O, ?& C ~0 W( ^0 y& s4 j- E! }/ u
F'=(F1'+F2'+F3'+F4')/4=(30+30+31+31)/4=30.5 4 R, g3 P+ D/ K8 D" i
f( e6 _9 e) ^5 K
于是: / s+ X- G$ g6 i& P E8 u9 j! |0 ?0 }8 n8 ~- E% U, }6 m. @) h7 S
9 E ]' p: I. D7 h. {$ y# V( D. d7 u( }( C! o' T0 }% R; u
G31=S1*S'=2.22*41=91.02 ! B$ E, |, X) y+ M9 y: |, x6 E$ g6 R0 t; A
+ D$ n) P# X# M
/ B; t+ [8 ~* V% G( U& \( f3 DG11=B1*B'=3.15*28.75=90.56 C) G/ }1 m2 G$ S% p) A4 L2 X5 A v
* [$ U* j) z. G; ~; ]
G01=F1*F'=3.01*30.5=91.8 2 b6 B# O% q. }" I: W0 ]4 L* c$ E* V( e+ w
( F* u2 d! m4 l, Q: f. J: y- K Y当然其它几家公司的凯利值也可以通过同样的方法求得,当然,事实上你不用去求(每场比赛这样求,不累死也气死了),赔率比较网站上都是这样算的。 好,到这里你应该可以知道了,凯利指数是怎么样被扭曲的了,因为除了赔率是真的,其它的都是做梦的时候梦到的(并非是攻击凯利指数,这个,前文和接下来的一比较就可以发现了)。 + J& N& @* n# J/ ]6 \
- h' k0 S: o, p& D" Y$ _+ _6 C* |* h W0 f7 S7 s3 A2 @. G$ i
7 S+ E: l7 n& Y3 W" Q" _) x通过对多家凯利指数的对比统计分析可以找出,数值变化与赛果之间的微妙关系,在足彩分析投注中能把握更多的冷门机会。 |
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数值变化与赛果之间的微妙关系,在足彩分析投注中能把握更多的冷门机会。 |
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