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本帖最后由 凯利之王 于 2009-7-13 09:48 编辑
0 W5 L& y; R9 ?* j& l0 D* f/ a/ y4 p# R- a1 ^9 v! c" H5 |6 ~ @6 \& ^; u0 z& {
凯利指数的计算方法: ( O1 m2 a L3 d; F& D k: T$ z- c5 |7 X' E& _+ i9 d( i
! L7 a4 j$ J3 R9 P' I8 }
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)& S6 ]3 c3 k8 o3 E. V
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. [- g- D9 n, x% W
+ J8 f% V7 } `2 z# ~) ^" v
& t" ]0 @) w! L( u* H% h) ]* p8 ]% Q# D/ J( ^/ E+ e
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!
* ^( g: V! C: ?" n6 s; Q3 m7 e6 Z/ _5 C5 S: K8 T8 s
0 T) B# V4 u. H% E做下算术了: 2 i( y$ \ W: ~: {8 \" `2 @( G; c6 ^- m1 h2 I- ^) N: _% f
; ~' L. y! k5 F, M& W+ d
! g. c% u+ y4 E. h4 W6 ]- }3 Z(1)SSP: 2.22 3.15 3.01 : `4 u/ N9 a2 y W3 e8 }9 n" u/ C6 S* V$ k* V6 d0 P
7 S9 E4 X( O0 q3 g! J: Y8 ]: f(2)立博: 2.10 3.25 3.00
3 k3 l8 P" E5 N! ^- X2 D2 \0 s+ O* |* ]& S# v; x a3 u `3 i) J
(3)威廉: 2.20 3.10 2.87 : D' ~# K. v* J, ^* k$ [ t
& T# h5 r R( f @! O
" q1 _6 l) N- b; V(4)易胜博:2.25 3.10 2.95
- M1 }9 h3 y, L/ w/ d" b. |- U+ {+ l. `) m% ~. _4 s5 o4 p: i c, d0 y5 x
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 Q6 o M. p) d0 t5 F8 F, p$ }' ]( i% c
7 v$ k2 f! P8 }, ?# ^# H, A+ _S1=2.22 B1=3.15 F1=3.01 3 B0 K* p9 X4 M. ?/ R
3 d# f: p# b4 Q6 z: R$ e! HS2=2.10 B2=3.25 F2=3.00 * Z& f9 A3 H ?+ B/ X) @4 F
% ^# T/ X4 W2 j% ] s
) \7 O0 M- f. u# E* M. \+ W- uS3=2.20 B3=3.10 F3=2.87 4 a+ E% h9 D7 z0 o. _. b
9 A' e& q. H7 B1 c9 S5 j
6 T+ m0 I: @2 g; K |1 n. SS4=2.25 B14=3.10 F4=2.95 ! ~0 p7 C' v# @. v; y G+ \
. N& m8 p+ o' H% r8 w( d5 ` _0 H- N/ h7 V4 v
4 ^! s6 l9 x" W: }; {" B1/r1=1/S1+1/B1+1/F1=1/2.22+1/3.15+1/3.01 => r1=0.91
: a: u3 z/ q" n* }' O L6 c) `9 f1 F5 r. Q: E7 F
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! d$ N, G" H* |8 L7 y x- [
# G! P2 i1 r. K, P6 s) ?% x1/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
% h+ S5 i; v6 g, \6 v! f, e( m' N1 H/ K( n' j2 w/ @* z
1/r4=1/S4+1/B4+1/F4=1/2.25+1/3.10+1/2.95 => r4=0.90
5 R5 O" h& t& N3 g* P# y8 J: G+ x9 Y- y- K6 r7 s3 d- C4 j, ~! |( e s
S1'=1/(S1*r1)=1/(2.22*0.91)=41 : W# q# m$ g# T2 x+ ~! m; y9 X1 v- W5 n) @
6 I- `, Y: k0 N0 J类似的计算后,于是: # s3 M- z! s6 q8 s- Z8 M j" T$ j3 D6 |* Y/ C- \" {
* M' }" u1 R6 C& G
S1'=41 B1'=29 F1'=30; * l& q( }' `7 X
2 b3 @3 A" u! x8 d# d! H
S2'=43 B2'=28 F2'=30 3 e- T: x' @% _% l" w5 s1 F0 C& k9 i2 Q
; m' V% T, u, P% O
( T' x8 O0 X- U Y' hS3'=40 B3'=29 F3'=31 X A4 g1 y V3 Q* d1 k
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0 y' K n! A1 L3 v. yS4'=40 B4'=29 F4'=31 % L1 t; H& s) {2 K% B
: B6 y" Y' M2 }4 T/ O0 g4 ~) e) q i4 v; _% {* H" L; p- z
(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( [. o9 n# U- S% u! _
* R9 Y/ Q" p9 \
# T3 b9 z V/ C) R& m, D0 u2 W好:S'=(S1'+S2'+S3'+S4')/4=(41+43+40+40)/4=41
* ?" W: D" N: M7 v' {6 c) q( ], k9 L T& t7 W6 V5 o9 E, }( B% n% Z* L' E x
B'=(B1'+B2'+B3'+B4')/4=(29+28+29+29)/4=28.75 ; _. v, i2 X, e7 [8 `9 a) v5 c
, P6 E2 X+ V6 S; B' ~# J" qF'=(F1'+F2'+F3'+F4')/4=(30+30+31+31)/4=30.5 3 ?. N' ]# p9 {# G9 A
0 G! A3 Y( o% E( f( w/ U% I
于是: / s+ X- G$ g6 i& P E8 u9 j! |0 ?
/ h8 V1 }# K2 v: Z9 E ]' p: I. D7 h. {! j% t7 P4 [0 c0 o' x H: n, \
G31=S1*S'=2.22*41=91.02 ! B$ E, |, X) y+ M( c, G. s G# _2 U9 |7 Z# h# y7 e
+ D$ n) P# X# M& `& F: h" E3 U( R& h, ]
G11=B1*B'=3.15*28.75=90.56
$ g) `) `; b( Z4 E& A: t+ K! k5 v5 F- Y4 l4 e
G01=F1*F'=3.01*30.5=91.8 2 b6 B# O% q. }" I: W0 ]7 V$ O$ |! Q0 K9 h
2 D/ Z( _2 L5 K" `9 i: }4 E
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 \1 o7 i7 J, i4 O8 A7 I2 M( W% `8 \, e
6 C* |* h W0 f7 S7 s3 A2 @. G$ i
3 q$ C- `4 {$ u1 ]& h$ Z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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