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| | 本帖最后由 凯利之王 于 2009-7-13 09:48 编辑 S2 v/ J2 x# |) V" Y* f/ a/ y4 p# R- a1 ^9 v! c9 s  K+ X! S2 }1 Q" p5 b: o0 \
 凯利指数的计算方法:    ( O1 m2 a  L3 d; F& D  k
 ) E2 H7 p8 r* e% B9 H
 ( i! Z/ W; Y  xG3=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)* B/ z1 L' T3 D; r' X$ S2 I
 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. [' k6 a3 t6 z, V- `3 l
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 & t" ]0 @) w! L( u* H% h
 ) B" _( P% X0 {2 m; A# S  j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!
 ; T& Z2 j& I, |0 ?3 k7 e6 Z/ _5 C5 S: K8 T8 s
 - ^) R7 `" d' x& z9 d做下算术了:    2 i( y$ \  W: ~: {8 \" `
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 (1)SSP:    2.22    3.15    3.01    : `4 u/ N9 a2 y  W3 e8 }9 n
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 (2)立博:    2.10    3.25    3.00
 ' u! q( v* m# e  G- [
 & Z4 i. Z1 j2 M+ R+ |; K) A(3)威廉:    2.20    3.10    2.87    : D' ~# K. v* J, ^* k$ [  t6 g9 [) S" s7 x
 # M  @7 D% f* w+ v
 (4)易胜博:2.25    3.10    2.95
 v5 W6 _# S' C1 E+ O, q- U+ {+ l. `) m% ~. _
 8 I) {3 G' j: b' F" u7 V) E. r) ^" y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
 1 W+ _7 k7 z9 m! k/ U3 X$ u5 F8 F, p$ }' ]( i% c
 . w& j3 m/ }' xS1=2.22    B1=3.15    F1=3.01
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 S2=2.10    B2=3.25    F2=3.00    3 O) w! N! _. h
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 7 P8 x, N# t% k/ _4 [2 JS3=2.20    B3=3.10    F3=2.87    6 l3 p* t1 i$ T3 N+ B% x) q3 t5 ]
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 S4=2.25    B14=3.10    F4=2.95    ! ~0 p7 C' v# @. v; y  G+ \4 {' F( @9 L: k" m8 e6 N- C
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 1/r1=1/S1+1/B1+1/F1=1/2.22+1/3.15+1/3.01    =>    r1=0.91
 * F, D) u5 t5 Y! o. ^9 p) ~- o2 Y
 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% F9 h' k: a: Q! R3 {9 F& G
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 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. V0 ], l. Z. o7 S- G  l7 U
 
 * y  C$ M5 l$ R  a+ t1/r4=1/S4+1/B4+1/F4=1/2.25+1/3.10+1/2.95    =>    r4=0.90    : f9 W: k7 E  Y2 @' w. y0 S% B/ j
 : G+ x9 Y- y- K6 r1 u5 d3 Y3 h' l
 S1'=1/(S1*r1)=1/(2.22*0.91)=41    : W# q# m$ g# T' i/ P0 a3 o, P9 y( H' g# H$ T' j
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 类似的计算后,于是:    # s3 M- z! s6 q8 s- Z8 M  j# I& H% r9 G* I& Z/ ~
 
 7 v* A, H8 x7 VS1'=41    B1'=29    F1'=30;    8 ~' A. {, K+ N) r9 t: ~
 + F$ p+ u, \7 f) f0 T
 S2'=43    B2'=28    F2'=30    3 e- T: x' @% _% l" w5 s
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 + z4 t1 n- z, FS3'=40    B3'=29    F3'=31
 ) o, e4 S8 P2 \+ o$ y( C0 m+ F6 z5 K/ n5 u, C9 L, h+ }+ O/ i% a+ B& W4 r4 q8 ]$ E# E& d! Q3 g+ K$ T* G
 S4'=40    B4'=29    F4'=31
 5 X3 z0 h/ N5 M/ b1 X: B6 y" Y' M2 }4 T/ O0 g4 ~  Q$ i2 y! d6 u5 G. s% K
 (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
 " |0 z; {5 [/ `- k8 |$ E0 |  T* R9 Y/ Q" p9 \+ L6 {( [: [+ }# V: [! G0 x
 好:S'=(S1'+S2'+S3'+S4')/4=(41+43+40+40)/4=41
 {2 w; j+ b$ W! O) q( ], k9 L  T& t: J% ~& r* P" ]: R8 C+ J9 E
 B'=(B1'+B2'+B3'+B4')/4=(29+28+29+29)/4=28.75    & z+ s; S) b/ Z8 u0 K8 B- O
 2 s' `# O2 t  Y: \6 @2 p
 F'=(F1'+F2'+F3'+F4')/4=(30+30+31+31)/4=30.5    8 J( K" n4 h6 V2 r2 z+ D
 
 $ N( ]! H7 W2 m4 W: c于是:    / s+ X- G$ g6 i& P  E8 u9 j! |0 ?
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 ; I" K+ B3 q) q7 P1 OG31=S1*S'=2.22*41=91.02    ! B$ E, |, X) y+ M! t! i. f, g1 C) x4 `9 ]- f
 + D$ n) P# X# M; l% l: q& u  L( |6 ~) ^" v+ j
 G11=B1*B'=3.15*28.75=90.56    6 W; h# o, I+ w4 M8 p4 Z6 w
 1 `, @4 [+ `4 b9 o
 G01=F1*F'=3.01*30.5=91.8    2 b6 B# O% q. }" I: W0 ]
 ; c" ]) i) D* e" X) [; u  U% a. o1 r1 X! L8 r2 U9 ]
 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 \
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 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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