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本帖最后由 凯利之王 于 2009-7-13 09:48 编辑
u/ \; v3 x3 Y3 Y* f/ a/ y4 p# R- a1 ^9 v! c( J8 Z! F2 E8 O! f8 Q% D$ h+ W
凯利指数的计算方法: ( O1 m2 a L3 d; F& D k% s$ _. l/ R3 r4 f2 m8 d' E( V
( i9 U1 z! z: |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)/ T9 k9 C4 u& J5 o# x% p1 M, m
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. [% w# u# X2 y1 E; c/ i8 B: h; w# s
4 _) ~+ j2 e$ l& G& t" ]0 @) w! L( u* H% h6 ]. s/ r+ N x
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!
0 ^4 M- k+ A. d/ V6 Q, `4 C7 e6 Z/ _5 C5 S: K8 T8 s* y0 w) b0 D1 E3 q# z/ U
做下算术了: 2 i( y$ \ W: ~: {8 \" `1 @" q! M- ~2 t, Q9 b0 o3 O
; ~' L. y! k5 F, M& W+ d
! V7 {, ?" _* j2 t/ d4 U(1)SSP: 2.22 3.15 3.01 : `4 u/ N9 a2 y W3 e8 }9 n
3 V+ B0 Z% M2 k1 b8 l( q9 c
5 W+ }( t- G' S8 H4 _(2)立博: 2.10 3.25 3.00
5 [& ^4 g9 M3 y& j6 T3 j* G" Y) B2 u! B
(3)威廉: 2.20 3.10 2.87 : D' ~# K. v* J, ^* k$ [ t% Q) P3 h$ p9 h' p7 K/ \% L
\. I) o& H. e6 n$ v
(4)易胜博:2.25 3.10 2.95 6 p% V4 g9 X: `; M0 a" f3 ?
- U+ {+ l. `) m% ~. _( u, W! ~( B! J1 ~* `7 O
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
' F1 o# Q) G; Z$ ^2 S) ]5 F8 F, p$ }' ]( i% c% o: Q+ X' n. U4 \2 K
S1=2.22 B1=3.15 F1=3.01 $ s* i* C. R, j% b* k+ r& e, c
2 x/ M$ @1 u' z! t* p) W
S2=2.10 B2=3.25 F2=3.00 ; {9 b+ {- D5 E
% ^# T/ X4 W2 j% ] s
3 j( E; C* o3 bS3=2.20 B3=3.10 F3=2.87 - Y: _; r& \! S# Y6 q
9 A' e& q. H7 B1 c9 S5 j5 I9 i* J- I: @4 o+ S* N* ^ `
S4=2.25 B14=3.10 F4=2.95 ! ~0 p7 C' v# @. v; y G+ \
5 m& P5 D! |( E* ]9 S8 w( d5 ` _0 H- N/ h7 V4 v
2 \, b. j. w, q- o1/r1=1/S1+1/B1+1/F1=1/2.22+1/3.15+1/3.01 => r1=0.91
; J6 i6 s4 d. p9 b7 {1 N0 s, a; |- D6 Z/ N) q( 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, t& y$ o1 c( B, }: _1 u
. K5 Z+ y+ W( ]5 B5 f ^8 a1/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' q7 r# l% }5 e$ p
) O/ P! P: H# N! y! o6 Z/ l3 M
1/r4=1/S4+1/B4+1/F4=1/2.25+1/3.10+1/2.95 => r4=0.90
1 ?* T, C. J( K: G+ x9 Y- y- K6 r; F: s# C- k, p% G& P4 J
S1'=1/(S1*r1)=1/(2.22*0.91)=41 : W# q# m$ g# T% Q: ?! }, a4 c# [
# P- E# E3 e! x$ \; _类似的计算后,于是: # s3 M- z! s6 q8 s- Z8 M j
! c; E' q# H7 j) ^4 c. _( Q8 k! T7 R/ `
S1'=41 B1'=29 F1'=30;
7 W/ o+ {4 c; k& A! E1 e, E# }. D
S2'=43 B2'=28 F2'=30 3 e- T: x' @% _% l" w5 s) o- s+ Q9 z4 s$ D$ e/ e" Z* S+ _
; m' V% T, u, P% O
, F. E6 g2 d+ O! J8 HS3'=40 B3'=29 F3'=31
: _8 t; d! b" j7 [' _3 H6 z5 K/ n5 u, C9 L, h+ }+ O/ i% a3 b+ Q$ ^7 E4 D* i: T
S4'=40 B4'=29 F4'=31 5 L9 y4 A- k4 C' R H5 ^1 ], O
: B6 y" Y' M2 }4 T/ O0 g4 ~/ o9 h8 ]! B' G+ } m
(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
" u: p a) t' x* R9 Y/ Q" p9 \
8 |8 H7 ^ p1 \$ t6 }; I/ u好:S'=(S1'+S2'+S3'+S4')/4=(41+43+40+40)/4=41 + ~* K+ G5 ~ @1 O$ `! ]. g
) q( ], k9 L T& t
! q6 h3 ~! c [( n' J" gB'=(B1'+B2'+B3'+B4')/4=(29+28+29+29)/4=28.75
" `. t, }% P# ~( |! E
8 Y0 f3 `7 x' w$ e- w9 wF'=(F1'+F2'+F3'+F4')/4=(30+30+31+31)/4=30.5
6 b. F( ~; h+ J# ^ X
7 _& W+ o* F0 L1 ~于是: / s+ X- G$ g6 i& P E8 u9 j! |0 ?
" J7 r4 F+ [3 L( Y D: g3 P a9 E ]' p: I. D7 h. {
- Z; {* w# r3 k& pG31=S1*S'=2.22*41=91.02 ! B$ E, |, X) y+ M
1 S V+ l' q% m+ D$ n) P# X# M6 c$ I* c5 R+ ~6 ^# k1 `9 s: z) C
G11=B1*B'=3.15*28.75=90.56 : V, p; n! Q0 _) O
& m( `7 g+ s, @ g1 x+ k4 NG01=F1*F'=3.01*30.5=91.8 2 b6 B# O% q. }" I: W0 ]: h5 W W( w" u/ q7 B F
. M% \: ]( O: ^* r+ D/ R" [
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 \
, O" ]( r5 U" z' y4 Z* f7 X, `6 C* |* h W0 f7 S7 s3 A2 @. G$ i/ {/ O( k7 z& E2 o- H
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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