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本帖最后由 凯利之王 于 2009-7-13 09:48 编辑
/ `0 B( W2 V ]( o" O* f/ a/ y4 p# R- a1 ^9 v! c. I6 Y2 |1 y5 r1 ^+ i1 L/ n8 a
凯利指数的计算方法: ( O1 m2 a L3 d; F& D k+ s! w. Z3 `" u" u7 g7 Q
# W; R$ A4 E+ i& { n9 zG3=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)0 H T+ U; p" B& G& o3 s6 l
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. [2 z2 M4 R3 x- D1 O
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& t" ]0 @) w! L( u* H% h( Y1 j% W- P6 ?& y2 e$ m' T7 \/ ^7 `
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! . N- |" b; p4 `/ l
7 e6 Z/ _5 C5 S: K8 T8 s' c. L) J4 B$ N* O
做下算术了: 2 i( y$ \ W: ~: {8 \" `( _3 l# i7 D# c' A- @, ]+ I
; ~' L. y! k5 F, M& W+ d
% L4 |# ]6 N& X9 Y(1)SSP: 2.22 3.15 3.01 : `4 u/ N9 a2 y W3 e8 }9 n1 ~3 t$ ~' u0 t3 M8 A
% M$ |. O) o! z% E& }9 C5 j(2)立博: 2.10 3.25 3.00
! e+ P5 H- k" c0 \3 _5 I7 J' d* l+ R& G7 e2 R
(3)威廉: 2.20 3.10 2.87 : D' ~# K. v* J, ^* k$ [ t
$ H2 J2 l( j" L* Q% I5 k' W& e+ |. K# L
(4)易胜博:2.25 3.10 2.95
* O1 m- m0 ]6 W& G! _/ I- U+ {+ l. `) m% ~. _4 i1 {6 q% S/ q* |$ P
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 z* a2 f2 m2 T+ P, f$ S9 F5 F8 F, p$ }' ]( i% c+ v5 j4 g& U* a' U6 k
S1=2.22 B1=3.15 F1=3.01
4 i; T, v7 k4 w* ~
4 @1 ~1 @: S) x' D# R+ ^S2=2.10 B2=3.25 F2=3.00
8 C% T" a9 B1 G' J/ _7 h% ^# T/ X4 W2 j% ] s# t* g7 k, A) `
S3=2.20 B3=3.10 F3=2.87
j, ]! d/ u( o) c! B, H8 E9 A' e& q. H7 B1 c9 S5 j4 ~# Y7 l. x$ |0 N: v
S4=2.25 B14=3.10 F4=2.95 ! ~0 p7 C' v# @. v; y G+ \
7 q) G6 J" R( X" ^8 w( d5 ` _0 H- N/ h7 V4 v
% J. e& c) p& e8 v& v* f- j1/r1=1/S1+1/B1+1/F1=1/2.22+1/3.15+1/3.01 => r1=0.91
" G- o( b d1 b$ w: I2 z% Q; }
2 z/ _- B- x/ _0 h1/r2=1/S2+1/B2+1/F2=1/2.10+1/3.25+1/3.00 => r2=0.90 # t0 ?( P e* X% l7 r) _6 g6 ^) c& a5 g# R* A5 q0 m& g
4 E* H+ \0 D/ _# 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' q1 t. s1 W0 d* x" u: U/ R; e
+ f3 w" v5 B3 n5 K5 v6 T
1/r4=1/S4+1/B4+1/F4=1/2.25+1/3.10+1/2.95 => r4=0.90
; Y2 d* x9 x7 ^/ T3 k- V r: G+ x9 Y- y- K6 r6 N, J" |9 n& g
S1'=1/(S1*r1)=1/(2.22*0.91)=41 : W# q# m$ g# T
$ ~8 X+ B+ j' n4 R# ]" [) x! E+ [1 F6 y& a
类似的计算后,于是: # s3 M- z! s6 q8 s- Z8 M j
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3 o9 u! i7 j) v! A8 IS1'=41 B1'=29 F1'=30;
! v" y8 D! T1 L2 H
! }! l& x; @2 |# }, g1 d' P* q% B ^S2'=43 B2'=28 F2'=30 3 e- T: x' @% _% l" w5 s
, M2 e% [) }6 M* }# }) b$ E8 z; m' V% T, u, P% O
8 I! o- R. V" F5 E* x3 @- mS3'=40 B3'=29 F3'=31 ' |5 q* e* r0 d- j5 `9 a1 I R5 X
6 z5 K/ n5 u, C9 L, h+ }+ O/ i% a
- |+ e' H- U8 \0 |# q* g" `S4'=40 B4'=29 F4'=31
4 A* I+ Q2 }- e: B6 y" Y' M2 }4 T/ O0 g4 ~( a: k3 K9 e$ N3 g1 g' R
(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
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2 e8 x6 P& q; u6 E) B @, u7 B+ g2 ]好:S'=(S1'+S2'+S3'+S4')/4=(41+43+40+40)/4=41
( X" X+ t9 A, C+ S1 I: X3 h" R) q( ], k9 L T& t
( y0 m$ K8 I# ?- f( f( G3 \B'=(B1'+B2'+B3'+B4')/4=(29+28+29+29)/4=28.75
) f( S/ [, u) g8 V3 T, q
! [% @" ]# K" A. H2 P6 f# SF'=(F1'+F2'+F3'+F4')/4=(30+30+31+31)/4=30.5
) o2 _9 ?7 Z0 {( a, |/ W
0 G& G/ M1 {4 \$ K! u于是: / s+ X- G$ g6 i& P E8 u9 j! |0 ?. n$ ~0 d! ^( D5 x) B' |
9 E ]' p: I. D7 h. {
$ D$ Q+ i% X6 ^; Y3 rG31=S1*S'=2.22*41=91.02 ! B$ E, |, X) y+ M: C( T* B3 V% ]" r. y
+ D$ n) P# X# M
. G; r% h/ U; E$ |! R, }* LG11=B1*B'=3.15*28.75=90.56
8 Y- b# Z/ M. Q5 f2 m- s$ N8 I% l( t) Q( t
G01=F1*F'=3.01*30.5=91.8 2 b6 B# O% q. }" I: W0 ]
4 o4 u4 u" V; y+ U: w
! C8 l6 N$ y4 K: O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 \
$ j9 W3 h: t. ]4 p2 s/ W6 C* |* h W0 f7 S7 s3 A2 @. G$ i
! G3 N9 \* D; g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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