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本帖最后由 凯利之王 于 2009-7-13 09:48 编辑* l/ l# X* f6 O8 C7 q+ I
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, f3 |# l8 d) A) P- Z+ g6 a凯利指数的计算方法: ( O1 m2 a L3 d; F& D k
: D% k& ~" n+ A1 H& D: N, s, z9 @3 w) T0 R- H w
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)
1 h. H4 |; ~% k; z8 h% _ |' C" 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. [ }$ M: f: W% q% A" b9 z& p2 z9 x
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& t" ]0 @) w! L( u* H% h+ F: t, j, ?) C" {& Q$ J% P
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! 1 T5 q6 B3 Q2 o) q4 V
7 e6 Z/ _5 C5 S: K8 T8 s
Z0 S* v# Z$ c$ V做下算术了: 2 i( y$ \ W: ~: {8 \" ` W9 l+ `6 g% n
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(1)SSP: 2.22 3.15 3.01 : `4 u/ N9 a2 y W3 e8 }9 n
, w2 f4 \# u$ @0 ~) ^" u( }
; L% V m/ Z9 F* Y2 e& `(2)立博: 2.10 3.25 3.00
; \% s, S2 s7 @3 Q
- r! [, j2 ?0 t(3)威廉: 2.20 3.10 2.87 : D' ~# K. v* J, ^* k$ [ t" d# O# w9 x' L
8 ~9 t% D T* w% ?% w7 C) [. U
(4)易胜博:2.25 3.10 2.95 3 L) b& X; U$ a- D' k+ \* T1 ^9 N
- U+ {+ l. `) m% ~. _
* `- K4 M5 Q' S+ ^0 B9 J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 ^" r( Y5 q/ [5 F8 F, p$ }' ]( i% c
: v5 T6 b/ h/ v6 N c! MS1=2.22 B1=3.15 F1=3.01 $ l2 m$ I$ ?9 H. l0 z `- |2 F
) v$ b8 \% T- ^% x& {0 E8 y' TS2=2.10 B2=3.25 F2=3.00
) y8 s. Q) q1 _. q" V% ^# T/ X4 W2 j% ] s
* @0 G- b" H6 g. n9 yS3=2.20 B3=3.10 F3=2.87
2 p" B5 w) v9 B9 `, e5 |# w9 A' e& q. H7 B1 c9 S5 j
. _7 j7 K4 m7 J; s. I5 Q. b8 wS4=2.25 B14=3.10 F4=2.95 ! ~0 p7 C' v# @. v; y G+ \0 s+ ^+ ~1 Y+ x% \
8 w( d5 ` _0 H- N/ h7 V4 v
4 g: ]5 C, k2 R( c: K4 ^5 C+ G1/r1=1/S1+1/B1+1/F1=1/2.22+1/3.15+1/3.01 => r1=0.91
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1/r2=1/S2+1/B2+1/F2=1/2.10+1/3.25+1/3.00 => r2=0.90 # t0 ?( P e* X% l9 b: S5 X9 q* T1 R9 {1 i
! l0 M2 _& N- n; c/ y$ i1/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
9 | D8 e2 V& l
: ~$ W$ [1 \* H9 S2 H+ f. y1/r4=1/S4+1/B4+1/F4=1/2.25+1/3.10+1/2.95 => r4=0.90 - b% B9 P1 ~" \$ `# e3 o
: G+ x9 Y- y- K6 r) p5 R2 M& G% I: C; Q$ M
S1'=1/(S1*r1)=1/(2.22*0.91)=41 : W# q# m$ g# T; q6 P$ H _8 q6 K( m/ W
; P6 M& w8 _7 I2 G9 B7 v$ i
类似的计算后,于是: # s3 M- z! s6 q8 s- Z8 M j
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S1'=41 B1'=29 F1'=30;
3 O$ @. X% b9 a4 Q7 G' u; u8 Y# V2 W% T5 X2 m- X
S2'=43 B2'=28 F2'=30 3 e- T: x' @% _% l" w5 s8 {3 A8 x- D6 v X# q1 V- H$ g
; m' V% T, u, P% O2 v- g! s( |! _+ C& A4 f' U
S3'=40 B3'=29 F3'=31
4 h+ |% Z) [0 g, ?6 z5 K/ n5 u, C9 L, h+ }+ O/ i% a
C0 A# \* @9 t; M! `S4'=40 B4'=29 F4'=31
* }% {+ O; o- {8 f, z: B6 y" Y' M2 }4 T/ O0 g4 ~$ {1 y6 a# P3 f1 t" ^* ]
(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
6 e* Z4 J1 C3 I5 Z* R9 Y/ Q" p9 \
* b2 E$ a( c! U6 q, {好:S'=(S1'+S2'+S3'+S4')/4=(41+43+40+40)/4=41
+ D4 G0 g) q2 k6 `0 y! W) q( ], k9 L T& t
/ S- H; M# ?: B: m. u) u' tB'=(B1'+B2'+B3'+B4')/4=(29+28+29+29)/4=28.75 z! t( \ S" \& k
9 Q% i, V+ X8 J( Q" b
F'=(F1'+F2'+F3'+F4')/4=(30+30+31+31)/4=30.5 $ L7 g6 U0 j* \. f2 X1 W
1 s; c" |1 m2 l# x: P% L7 m于是: / s+ X- G$ g6 i& P E8 u9 j! |0 ?
! i1 n7 R: u% d( _9 E ]' p: I. D7 h. {
9 ~. L9 A1 m6 } }: m" V% S0 n" CG31=S1*S'=2.22*41=91.02 ! B$ E, |, X) y+ M" w. A2 X+ q( N* g% [
+ D$ n) P# X# M" Q F$ U( M7 n3 c$ e9 H
G11=B1*B'=3.15*28.75=90.56 ) a1 z8 g3 ^1 N0 W' o; }9 k
- t0 [/ p+ S, o+ p' X5 g; N7 OG01=F1*F'=3.01*30.5=91.8 2 b6 B# O% q. }" I: W0 ]. g- T, U& I( M* b, H6 N$ G9 j
4 v' l8 i8 C1 L( n8 d9 T
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 \- K; C+ r3 W# H! V; k( q' P
6 C* |* h W0 f7 S7 s3 A2 @. G$ i' C) a5 X; A- f+ m; ^
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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