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本帖最后由 凯利之王 于 2009-7-13 09:48 编辑
& J S; } {4 Z* f/ a/ y4 p# R- a1 ^9 v! c
% S4 v% T ]2 y# z5 H/ t! `7 A凯利指数的计算方法: ( O1 m2 a L3 d; F& D k9 Y0 _/ X0 y1 [+ S0 i1 g5 {, W
8 w' f# q3 ~/ Z p$ j MG3=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)
8 L3 s6 @( J2 q+ ?8 t# ?6 R& m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. [0 c0 M' V" f3 q
0 z4 u, |( a* y
& t" ]0 @) w! L( u* H% h
- f N' _) S' f V* Y5 s) q. d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! 8 t* a9 k9 `8 I" ~( n. J1 {
7 e6 Z/ _5 C5 S: K8 T8 s& E; V5 E8 |) f* `" ?0 c( p4 A
做下算术了: 2 i( y$ \ W: ~: {8 \" `( J4 ^3 _4 \ Q$ z( \
; ~' L. y! k5 F, M& W+ d
1 [/ k& o) K9 j(1)SSP: 2.22 3.15 3.01 : `4 u/ N9 a2 y W3 e8 }9 n
( g- s5 W6 M4 {' P' t2 K
& f. C0 f& w! ^: d# |* O(2)立博: 2.10 3.25 3.00 % B: k/ {& q% I6 ]4 i) @& N2 S u
2 x7 `& s' `7 Y% c& @
(3)威廉: 2.20 3.10 2.87 : D' ~# K. v* J, ^* k$ [ t
7 E2 r: B5 q7 p' }. x7 N: |: L2 S5 a P3 q
(4)易胜博:2.25 3.10 2.95 1 z; e2 t6 e. C$ o; D
- U+ {+ l. `) m% ~. _
: u" X/ }' Z* p+ b: D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
, C- ?2 e9 j5 }. Y9 ]5 F8 F, p$ }' ]( i% c" G4 A& {; e: P/ [: |
S1=2.22 B1=3.15 F1=3.01 & {9 u$ J$ a7 X7 z" V! H& H7 a
' x d* w2 c; z" P: `3 OS2=2.10 B2=3.25 F2=3.00
9 B$ G8 w- N+ @# Q, X% ^# T/ X4 W2 j% ] s; B1 E2 B' f% I" e' N! b
S3=2.20 B3=3.10 F3=2.87 & X: R5 G E8 S0 x! N
9 A' e& q. H7 B1 c9 S5 j
* U" d' m* s0 rS4=2.25 B14=3.10 F4=2.95 ! ~0 p7 C' v# @. v; y G+ \
. ]0 x$ i8 Z" b8 w( d5 ` _0 H- N/ h7 V4 v t. V R# v' A; p) T3 e
1/r1=1/S1+1/B1+1/F1=1/2.22+1/3.15+1/3.01 => r1=0.91
1 x2 k; B# L! R# @. z) m6 m" X) a5 K; @, ~" H3 A U Y/ L, g' M) ]
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) N, s8 i/ A& T
0 S. D. S" h" C! W7 ~4 ~7 b0 s
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
" H8 R. B! R7 T( H; c! \$ J
" |0 l+ B* Q. w% r( P+ O9 P1 q* F3 h1/r4=1/S4+1/B4+1/F4=1/2.25+1/3.10+1/2.95 => r4=0.90 1 t8 ?* P6 U, I1 G k
: G+ x9 Y- y- K6 r/ `/ ^3 w1 d' r% F
S1'=1/(S1*r1)=1/(2.22*0.91)=41 : W# q# m$ g# T
X4 i! @( @4 s+ X6 x; W2 L! c i$ v2 [& ^7 x
类似的计算后,于是: # s3 M- z! s6 q8 s- Z8 M j4 V& J( m3 P: G. z3 s
4 l8 C, S) G, G& P3 [" ZS1'=41 B1'=29 F1'=30; 5 _5 W1 @' r5 @5 r. J% f$ p
8 A1 I+ Q0 x g6 Q @
S2'=43 B2'=28 F2'=30 3 e- T: x' @% _% l" w5 s
1 R' G0 U2 n% ^9 ]; m' V% T, u, P% O
6 U9 P' A8 W- O1 f( Y1 dS3'=40 B3'=29 F3'=31
5 y) r$ o- b) g2 Q' s& K6 z5 K/ n5 u, C9 L, h+ }+ O/ i% a
# P+ p' v1 ~7 T j1 |. US4'=40 B4'=29 F4'=31
# [/ L9 h- h% P& H% V+ e- \: B6 y" Y' M2 }4 T/ O0 g4 ~
- @& [8 u6 a# }* |6 D9 c(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) j$ @) J9 Z1 z5 n* R
* R9 Y/ Q" p9 \9 @# m+ K0 v2 Z) @
好:S'=(S1'+S2'+S3'+S4')/4=(41+43+40+40)/4=41 - ]) `7 n3 D' ]( F. I
) q( ], k9 L T& t
. U; ~$ S) F6 r4 q1 KB'=(B1'+B2'+B3'+B4')/4=(29+28+29+29)/4=28.75
1 |' h! G" J* G2 z, g$ M9 h
, ?5 T, @& z' k3 |1 q3 IF'=(F1'+F2'+F3'+F4')/4=(30+30+31+31)/4=30.5 : T% v9 V5 @3 o8 L& _/ s
" N: q1 D# ^' C% }+ i7 k2 z于是: / s+ X- G$ g6 i& P E8 u9 j! |0 ?6 y# Z0 G* b% o- ]) J$ n
9 E ]' p: I. D7 h. {
) n" y" E2 |8 X$ T! r5 t' PG31=S1*S'=2.22*41=91.02 ! B$ E, |, X) y+ M/ L S; c- C' F6 e- ~9 ]% {
+ D$ n) P# X# M2 T" a. Z, T7 H( c6 z( W" d) c" D
G11=B1*B'=3.15*28.75=90.56 + y0 E9 c1 r. s- |# n9 m) Z1 E
3 W" x$ e% v5 G+ nG01=F1*F'=3.01*30.5=91.8 2 b6 B# O% q. }" I: W0 ]- C: ]$ A) W, v) I
$ \/ N+ n* C, X$ Z
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 \; \" l# u2 J' @: B. `
6 C* |* h W0 f7 S7 s3 A2 @. G$ i
; a2 f( y+ i! l* w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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