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本帖最后由 凯利之王 于 2009-7-13 09:48 编辑
& q, M% X e: D+ v) L; B; G* f/ a/ y4 p# R- a1 ^9 v! c
0 ~4 y8 u. r4 S+ O凯利指数的计算方法: ( O1 m2 a L3 d; F& D k, O: X0 `1 s8 A. R, N5 b& v
. [; ?0 [' b; J# U9 @; f
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)
* y) Z N9 s! I/ g+ e0 `- n' \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. [! y2 }+ U' y) u1 S; y' O
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& t" ]0 @) w! L( u* H% h
9 B. s5 b6 T" L1 T( \6 V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! 3 Y" I T1 O8 A
7 e6 Z/ _5 C5 S: K8 T8 s* I/ d, x/ C* V* E1 l# q
做下算术了: 2 i( y$ \ W: ~: {8 \" ` l& C1 ~ R; N" Y. [2 X0 D, ?. M
; ~' L. y! k5 F, M& W+ d+ P* o3 ^8 H; S% z) s! G
(1)SSP: 2.22 3.15 3.01 : `4 u/ N9 a2 y W3 e8 }9 n
7 A; y0 p2 b! n$ _4 Z0 T* D7 a
! K) I1 K% O$ [% C) H* `(2)立博: 2.10 3.25 3.00
* U% Z$ U5 @* h5 `- @
9 ~7 h1 |* Q3 Z, p+ f(3)威廉: 2.20 3.10 2.87 : D' ~# K. v* J, ^* k$ [ t+ o0 N( W Q4 X$ i! d& ^9 |
& I- b* [" n& Y5 s! b2 q6 k
(4)易胜博:2.25 3.10 2.95 . q8 x8 j D# G& _ T5 ^" I
- U+ {+ l. `) m% ~. _
7 D4 q; u( O' N; A+ e: n: g6 }" @3 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 5 U# X* m$ \! I7 o4 c2 J* n
5 F8 F, p$ }' ]( i% c4 G, p: |5 b% ?/ c9 m) o& l- G
S1=2.22 B1=3.15 F1=3.01 0 d0 p& k& L' X, \1 G! O* G
9 l, U# f8 b m( U% nS2=2.10 B2=3.25 F2=3.00 ' G; Q( i0 B0 d+ Y- g' q+ J
% ^# T/ X4 W2 j% ] s
; N4 Q" `: [) T) P+ g5 j0 {S3=2.20 B3=3.10 F3=2.87 9 A0 w/ b8 k2 E9 k- B
9 A' e& q. H7 B1 c9 S5 j A+ v$ O4 |9 P6 y! Z j2 h
S4=2.25 B14=3.10 F4=2.95 ! ~0 p7 C' v# @. v; y G+ \
. x: M* C" V5 l3 F8 w( d5 ` _0 H- N/ h7 V4 v* k8 @# O' q( Q; V: w
1/r1=1/S1+1/B1+1/F1=1/2.22+1/3.15+1/3.01 => r1=0.91 & C0 g9 B2 @' {, v/ t5 ~ z
V$ Y( t2 `+ p5 [2 y% d V. P! W1/r2=1/S2+1/B2+1/F2=1/2.10+1/3.25+1/3.00 => r2=0.90 # t0 ?( P e* X% l' L- U9 P: V2 [- b
+ k' Z, D8 o8 ?
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
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1/r4=1/S4+1/B4+1/F4=1/2.25+1/3.10+1/2.95 => r4=0.90 # f( u ^# _5 }7 t, s8 g. c
: G+ x9 Y- y- K6 r
( f2 S; ]* h2 `" _% k- wS1'=1/(S1*r1)=1/(2.22*0.91)=41 : W# q# m$ g# T3 n8 L0 e0 I& l& _7 n' V/ d" z
/ h, z: h' D- u. W
类似的计算后,于是: # s3 M- z! s6 q8 s- Z8 M j' g6 b& @$ x9 e8 J4 J- Z
3 x g: i, K4 y4 d& P* t8 s# I# O- Y0 I
S1'=41 B1'=29 F1'=30; 7 E, u! S6 V e: U. {
0 M& T K8 L1 d% `) n+ n) T3 XS2'=43 B2'=28 F2'=30 3 e- T: x' @% _% l" w5 s. t8 z2 g6 u, F$ ^9 b m
; m' V% T, u, P% O
' ^) j5 b; \, t/ X+ O5 v+ u1 ?S3'=40 B3'=29 F3'=31
! i; y: e: e. ~2 p6 z5 K/ n5 u, C9 L, h+ }+ O/ i% a2 m/ S0 D ?! R, P
S4'=40 B4'=29 F4'=31
5 k8 T& z, Q4 q: B6 y" Y' M2 }4 T/ O0 g4 ~6 @1 _1 P, R, _0 X$ @
(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% f* y; { {1 C+ G7 ]
* R9 Y/ Q" p9 \
: \* m+ Y, l+ e9 S% Q: M好:S'=(S1'+S2'+S3'+S4')/4=(41+43+40+40)/4=41 " H. i% s: @) ^; V
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B'=(B1'+B2'+B3'+B4')/4=(29+28+29+29)/4=28.75
2 w3 Y. k- [' Z- S- H7 { T% F5 A5 @5 Y8 l) R* B
F'=(F1'+F2'+F3'+F4')/4=(30+30+31+31)/4=30.5 - p0 g( J* X+ y R' ~9 p* ^- Z
4 ]+ z" m: k x2 ]8 u
于是: / s+ X- G$ g6 i& P E8 u9 j! |0 ?
+ C, k. @, Y6 @* t9 ?6 a$ }! |9 E ]' p: I. D7 h. {/ E8 f V" R' B" O# [4 W
G31=S1*S'=2.22*41=91.02 ! B$ E, |, X) y+ M) z& X- ]" E1 e6 U* `8 W
+ D$ n) P# X# M
; d# _& [4 {7 w2 q$ s3 ?; @* UG11=B1*B'=3.15*28.75=90.56 6 w5 }# P0 e8 W7 A3 b3 D; E d
3 H( q/ ~- |" _2 F6 VG01=F1*F'=3.01*30.5=91.8 2 b6 B# O% q. }" I: W0 ]& E8 e0 p E) }* T, x# N3 E/ c
0 t/ i2 D4 C. g' l+ u
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 \
/ h8 w4 ?+ L: D# [6 C* |* h W0 f7 S7 s3 A2 @. G$ i
1 p) \. |: e7 c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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