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本帖最后由 凯利之王 于 2009-7-13 09:48 编辑
+ V: \8 r' x& G2 L0 w* f/ a/ y4 p# R- a1 ^9 v! c. R: C' @! V$ q9 m* R; e3 P
凯利指数的计算方法: ( O1 m2 a L3 d; F& D k% ?9 J5 s& l K3 Q7 _; t% P
4 K3 h7 h" S2 O3 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). r6 }. J: ?% E3 d, 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. [5 }& W3 k7 R& J9 W' r
- [" H p4 Q6 A! Y1 s# v/ _) Z% u
& t" ]0 @) w! L( u* H% h
2 Z7 n" C1 O" l" ~; t4 L8 Z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! ; e5 ]% Z% n2 Q4 A3 }5 r: G% N, u
7 e6 Z/ _5 C5 S: K8 T8 s
5 c" u+ \8 O" `3 \, y1 i$ C做下算术了: 2 i( y$ \ W: ~: {8 \" `
$ }: m6 N* y; F9 w8 Q9 T+ {; ~' L. y! k5 F, M& W+ d
$ e1 f. ]! c) u% A* V6 J(1)SSP: 2.22 3.15 3.01 : `4 u/ N9 a2 y W3 e8 }9 n' ^; o9 v. d& r' q$ P
1 h( A4 @$ W, E$ c(2)立博: 2.10 3.25 3.00 - o" ]* g; [# t' V0 q, ]
' I" K; O5 R5 R: ?/ ~8 B
(3)威廉: 2.20 3.10 2.87 : D' ~# K. v* J, ^* k$ [ t9 z4 Z9 l' w% D) `7 X1 X, u! `3 Q
4 [& y% A3 ` l7 E) a9 X! {" V# b1 W5 r(4)易胜博:2.25 3.10 2.95 5 v* z6 k/ |$ J" C6 ]6 _! Z) i; c
- U+ {+ l. `) m% ~. _5 ]* u2 ~+ T# ^
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
+ X* q2 a! @9 L+ O5 f5 F8 F, p$ }' ]( i% c) `1 a# a1 Z# P8 Y6 {
S1=2.22 B1=3.15 F1=3.01 6 W. `8 p* D m( W* `% q/ b. o
" l8 ^- R s9 s/ KS2=2.10 B2=3.25 F2=3.00 6 A2 o$ v# T2 D0 ?
% ^# T/ X4 W2 j% ] s; K; q3 v |+ m" G
S3=2.20 B3=3.10 F3=2.87 " r2 y. x: p, D1 w3 A
9 A' e& q. H7 B1 c9 S5 j0 C2 K& l$ i% x$ i
S4=2.25 B14=3.10 F4=2.95 ! ~0 p7 C' v# @. v; y G+ \" }" k- _$ @, C3 u1 P
8 w( d5 ` _0 H- N/ h7 V4 v$ e& O0 F) G3 ~ w7 U7 Y% m
1/r1=1/S1+1/B1+1/F1=1/2.22+1/3.15+1/3.01 => r1=0.91
% I: z: k- K; O4 z4 V# H6 O5 Z* C6 X% L4 L: o: Z2 ~
1/r2=1/S2+1/B2+1/F2=1/2.10+1/3.25+1/3.00 => r2=0.90 # t0 ?( P e* X% l0 e2 Z& L/ w0 q$ i
3 P+ p! K- u7 \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
8 }: K7 W* l: k+ {: p5 S
. }6 w( v& C1 X v! V0 O0 K m1/r4=1/S4+1/B4+1/F4=1/2.25+1/3.10+1/2.95 => r4=0.90
' X/ ~0 Y6 X0 { ?: G+ x9 Y- y- K6 r
* F% Q0 R, n3 k, Q; x" w6 B8 g4 YS1'=1/(S1*r1)=1/(2.22*0.91)=41 : W# q# m$ g# T4 F; Z8 ]5 W3 o9 B& C9 s
, Q- |( y! Z' I* B) g类似的计算后,于是: # s3 M- z! s6 q8 s- Z8 M j
2 r- S2 D6 h* G9 Q" q7 @- m1 D; r; S2 H- m
S1'=41 B1'=29 F1'=30;
- q. Z+ ]9 s& F+ c6 y3 m% @: f! b' y7 i6 n; b
S2'=43 B2'=28 F2'=30 3 e- T: x' @% _% l" w5 s
$ _+ I# K; D) u. i; m' V% T, u, P% O
' F0 _7 n" _3 h' k$ x1 N9 U. WS3'=40 B3'=29 F3'=31 ; ^ F% q; A' z1 q
6 z5 K/ n5 u, C9 L, h+ }+ O/ i% a
, F$ g0 m; z" f) s& j' g. nS4'=40 B4'=29 F4'=31
* Z( Q$ [5 ]/ s, E+ E" v: B6 y" Y' M2 }4 T/ O0 g4 ~8 d6 C N) u. P+ o
(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
4 H5 I0 C* ?; e: l8 X8 U& v* R9 Y/ Q" p9 \2 Y, H6 h6 T2 B6 U$ ]( F' O- o
好:S'=(S1'+S2'+S3'+S4')/4=(41+43+40+40)/4=41
' A1 N5 y* a" V/ F& h1 f) q( ], k9 L T& t
/ b5 o8 g* }1 X4 |6 wB'=(B1'+B2'+B3'+B4')/4=(29+28+29+29)/4=28.75
; L% J, x7 [% J$ K8 W# w
7 }1 U% |; D+ F( |/ Z* C5 \" }F'=(F1'+F2'+F3'+F4')/4=(30+30+31+31)/4=30.5
) j+ `# }: d4 Y8 t
! g) Z2 u% v* p* I B8 w3 t: n, a, x& ^于是: / s+ X- G$ g6 i& P E8 u9 j! |0 ?' h- G5 M& [( d$ k4 v k
9 E ]' p: I. D7 h. {
, {: O7 ^. \, C1 k0 HG31=S1*S'=2.22*41=91.02 ! B$ E, |, X) y+ M
+ Y& [5 _" ]( y; c" J7 F+ D$ n) P# X# M
2 n7 U% _: c7 `# j* O2 IG11=B1*B'=3.15*28.75=90.56 / C7 F2 g$ B( u) e3 z- \3 U
6 \/ y) d, l* I3 n" TG01=F1*F'=3.01*30.5=91.8 2 b6 B# O% q. }" I: W0 ]. a+ c6 S$ U b$ I- k! `
; k& [- q8 c) c" k) E8 P4 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 \
! _5 ~. j: m: Q5 {6 C* |* h W0 f7 S7 s3 A2 @. G$ i$ U# Z, q$ u' b; b
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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