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本帖最后由 凯利之王 于 2009-7-13 09:48 编辑
! p% I% f. G! G* f/ a/ y4 p# R- a1 ^9 v! c: l D& @; g& V) W- P
凯利指数的计算方法: ( O1 m2 a L3 d; F& D k
5 O$ J5 S* p; F9 E4 [7 F& V. ?" F
r- @$ }' Z1 L9 v' c% uG3=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)
& m7 _) x/ y& C3 X4 D" w* A- X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. [+ i( q" o8 h1 i1 B9 W4 q
. L5 x) m: D8 X' ]% @& t" ]0 @) w! L( u* H% h
0 Z* U+ e: r; 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! ( Q7 k# ? k0 H" j1 _2 c6 o
7 e6 Z/ _5 C5 S: K8 T8 s6 _/ P- U- S% N$ K# E. i
做下算术了: 2 i( y$ \ W: ~: {8 \" `: ?9 k6 u- {( t2 S! f6 q; f
; ~' L. y! k5 F, M& W+ d
9 Q' v0 X0 T2 C3 ^# s, f' W(1)SSP: 2.22 3.15 3.01 : `4 u/ N9 a2 y W3 e8 }9 n6 m6 q; F: I, |% Z4 T* C! o
1 h X, z3 H( U3 n! p7 s5 z(2)立博: 2.10 3.25 3.00 ( f# M& `2 ?* G
& q+ \8 y' H' W
(3)威廉: 2.20 3.10 2.87 : D' ~# K. v* J, ^* k$ [ t* g( p# r' D- {' \. l( E3 ]
0 R) n6 T& f; Q0 d; Z(4)易胜博:2.25 3.10 2.95 / O; A& v; q3 x7 { w) p
- U+ {+ l. `) m% ~. _# V& S+ A/ M2 b% `+ ^3 M) f
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 3 Q; X! D8 A: `4 W D$ B; M
5 F8 F, p$ }' ]( i% c3 X7 I3 _/ K/ `. S
S1=2.22 B1=3.15 F1=3.01 ! L2 H% L: z3 K& U# C+ D+ f
, v% y: B" n* e5 DS2=2.10 B2=3.25 F2=3.00 9 u& d1 M0 G! v! _0 s
% ^# T/ X4 W2 j% ] s' ?5 m9 I8 Q6 d R
S3=2.20 B3=3.10 F3=2.87
! N6 i2 l2 ^; b4 K0 v9 A' e& q. H7 B1 c9 S5 j
: D" D; ~; k3 y9 `- M0 KS4=2.25 B14=3.10 F4=2.95 ! ~0 p7 C' v# @. v; y G+ \
' f8 U2 J. n1 M" W8 w( d5 ` _0 H- N/ h7 V4 v
2 W$ w- n1 l; V1/r1=1/S1+1/B1+1/F1=1/2.22+1/3.15+1/3.01 => r1=0.91 & @& u8 A* A! E4 ?4 o
6 H& N. @1 f, G, J; q8 H- h, e* P1/r2=1/S2+1/B2+1/F2=1/2.10+1/3.25+1/3.00 => r2=0.90 # t0 ?( P e* X% l- u$ x! j( H$ [6 B% x( _$ ?
; D$ K+ u' s( B* T8 {9 `/ {% S1/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
+ f* Y, z0 W' f9 _) p* s$ z$ Q' {+ T4 ~# Y4 f7 i! w
1/r4=1/S4+1/B4+1/F4=1/2.25+1/3.10+1/2.95 => r4=0.90 + @4 _3 U6 j! U2 }" H2 k
: G+ x9 Y- y- K6 r/ T$ y0 g5 I! i) M3 i2 B3 P4 `) H
S1'=1/(S1*r1)=1/(2.22*0.91)=41 : W# q# m$ g# T p1 @+ j4 e. [9 Z# [2 z4 b
. q) g: i$ }, j类似的计算后,于是: # s3 M- z! s6 q8 s- Z8 M j
" C4 a. M& b+ _2 V
( F" I( @+ Y: d, R" ~S1'=41 B1'=29 F1'=30;
' ? c3 |8 v* s2 I: u j4 c% N, \6 v1 I' U# s
S2'=43 B2'=28 F2'=30 3 e- T: x' @% _% l" w5 s
4 J6 b6 |2 K' M; m' V% T, u, P% O
9 U) e4 A! h/ ^9 SS3'=40 B3'=29 F3'=31 9 z2 e+ z( g0 X3 X) C, i
6 z5 K/ n5 u, C9 L, h+ }+ O/ i% a4 W p7 E/ S+ L/ W+ y1 n3 M$ L
S4'=40 B4'=29 F4'=31
[1 |7 e! E5 a& y v$ m2 X: B6 y" Y' M2 }4 T/ O0 g4 ~, P& ^' m. S5 u* t) V
(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
* [8 F* I5 }* X+ ?7 r N7 Y* R9 Y/ Q" p9 \! s2 c- Z/ O7 D' @; O' k d$ o
好:S'=(S1'+S2'+S3'+S4')/4=(41+43+40+40)/4=41 2 G& `6 k3 ~% ]
) q( ], k9 L T& t1 E# p0 L5 {: ~" E3 A, I
B'=(B1'+B2'+B3'+B4')/4=(29+28+29+29)/4=28.75 1 ^. ]& E3 a1 K7 E
3 R+ X* A) Y1 S Z: m. |7 `/ B/ qF'=(F1'+F2'+F3'+F4')/4=(30+30+31+31)/4=30.5 0 P7 D% B( J% y/ |3 a
4 [4 ?4 ^! v7 L; w) g7 z于是: / s+ X- G$ g6 i& P E8 u9 j! |0 ?" e) N% J4 o9 I: ^+ N
9 E ]' p: I. D7 h. {$ d, _* O4 | O
G31=S1*S'=2.22*41=91.02 ! B$ E, |, X) y+ M! j q. g3 |: M- z5 T
+ D$ n) P# X# M
1 Z' {% ~" @" c% o6 N B# e4 ?8 uG11=B1*B'=3.15*28.75=90.56
1 R5 d1 N! k8 V: `+ |& ^6 I1 M5 o' g' K
G01=F1*F'=3.01*30.5=91.8 2 b6 B# O% q. }" I: W0 ]+ d( t" x5 a9 a* x
5 E: u9 w1 \5 T" M$ i, t* k: h
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 \) C% v @! A) M0 k
6 C* |* h W0 f7 S7 s3 A2 @. G$ i
: ^ ^$ R7 d j. ]3 a/ l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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