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[打法交流] 那些让你倾家荡产的DB策略(转)
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      赌徒谬误:押一边赌概率不靠谱+ H) o# T0 u/ x4 e, t

1 e: c5 c9 }8 {  实际上,如果我们抛开彩票运作机构的操控行为,单纯从本质上来说,这种“赌局”纯粹就是一种概率游戏。5 P! `, t6 @7 A* H
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  既然靠的是概率,可能有不少朋友都想过,假如我玩骰子,我一直押大(投出4、5、6点),只要坚持,押到死,最后就一定会赢钱。
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  这种想法依据的是“大数法则”,只要我玩的次数足够多(n次),则开出大或小的次数与总投掷次数之比,应该无限趋近于50%。
5 G# H4 y% s. F) B6 m0 T
" n# X, e, A- y. ?+ u8 a2 l0 }  即:n→∞时,n(大)/n = n(小)/n = 50%。. f+ T! N: T% J% I5 ?5 N! u
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  根据这个定律,一般人会想:如果我押大,第一次开的小,第二次开大的可能性就会增大。' K2 Z% L+ }% b. G2 D
+ |. g2 Q+ d" h- ]1 q6 L! z
  但实际上,第一把开出小,并不会影响第二把开大小的概率。第二把出大或出小的概率,同样都是50%。5 W/ t( J3 X3 ]( ~1 P  J

& w' g9 H2 Q3 |" @' u1 C, C  同理,就算你玩了十把,每把都是小,第十一把同样是50%概率出小、50%概率出大。0 n& V, ]+ _# L3 {' J
+ S/ c6 ~! H) u% @9 i
  看到这你可能会有疑问,根据大数法则,出大的概率应该会越来越大才对啊?* r7 C6 ^3 H& u# v8 ~6 B7 I/ S4 y
7 q3 |5 ~' b1 i# ~5 q& K0 Y  m* J
  不对。你忽略了一个重要的前提:n→∞。6 _; {1 H* u* K1 k* c

8 p; N- a! v0 c2 r6 {. y/ b  只有在玩了足够多的局数、投的次数足够多了之后,才能满足大数法则的结果。
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  ?" _, L  L8 }" p; i9 }5 I$ Q1 `  也就是说,当你玩了10万把甚至100万把时,开出大的概率才有可能接近50%。但你只玩了十几二十把时,大数法则根本不起作用。
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6 N( p$ _$ g, ?+ N9 K9 }( T/ ]  这就是概率论中经常提到的“赌徒谬误”。, b+ ]) j( Y5 i
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     现在我们知道,这是种典型的赌徒谬误。目前双色球的期数远远不能满足大数法则。除非过了十几万期甚至几十万期之后,所有数字出现概率才会近似相等。' e, e( J3 a( J, Y$ @
4 m# F( W4 ]! x
  错误策略,让你倾家荡产) y4 c( j' A3 w, k

8 P  i# U; n) `9 \: J  当一个人陷入赌徒谬误之后,为了一次回本,往往就会采取一种错误的策略,结果错上加错。这种策略就是“错了就加倍”。  G: J$ n- f! W4 E  K
4 l8 |8 g1 d! c2 r% c# v3 T4 n% b
  还拿玩骰子举例。比如我押大,每把押1块钱。第一把如果开的是小,我输了1块,第二把我就加倍,押2块。如果这把赢了,不仅能拿回第一把输的1块,还能多赚1块。
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: F& r, ^* b8 ^2 {5 a  如果第二把又输了,根据“错了就加倍”的原则,第三把我押4元,如果赢了,还能多赚1元。
2 Y: ~, {7 F) D) h& Y: M6 l7 ]( Z$ r+ [9 @/ Y5 [2 H
  如果一直玩下去,就会形成1,2,4,8,16,32......这样一种数列,最后看似一定会赚1块钱。但真的是这样吗?! s7 m* g. V% m2 H" e* s
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     “错了就加倍”的策略存在很多问题,首先是资金量限制。1 ?, t3 W! j2 Q( }. L

+ W/ Z$ J8 x+ \- J3 I; J  假设你玩了10把都没赢,这时候你已经输了1023元,如果要回本,第11把你需要拿出1024元去赌。" k, V2 ]2 u8 {) C9 s  T, h  D
# s5 H1 Y) ^* q; C
  有朋友说,1024元小意思,我拿得出。但真正的赌局哪有1块钱开局的?) L, X+ _+ ~5 W, @  H7 i& B
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  如果你第一把就押了1万,连续10把没赢,第11把就必须拿出1024万才有可能回本——注意是“有可能”回本,但你有那么多钱吗?
4 v3 M/ A4 z. G- z! \1 |' n& h2 d0 Q8 f& j$ m( ]( P, f8 E
  其次,很多赌局是有金额上限的。比如赌局规定每把上限500万,就算你真的有1024万,也没办法一次性押进去。9 C7 t7 ~. p1 j# }

9 z9 u6 s$ a: K- e  所以,在真正的赌局中,“错了就加倍”是个无底洞,采用这种策略的人,最后基本都是倾家荡产。
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# s0 `( `5 j& d6 F  在股票中,很多人也陷入了赌徒谬误的怪圈。3 X; \! M" S( P

4 k4 n5 Z( o. D* [# w$ T  比如我买了一只股票,买完就跌,于是我补仓,博反弹;结果又跌,加倍补仓;再跌,再加倍补仓。补个三四次之后发现,没钱了,但股票依然没止跌。5 G+ J0 z8 z) R+ ?
$ ?7 G, b) O& q1 B% Y
  这种盲目补仓博反弹,相信不少股民都有过类似的行为,但最后的结果就是越套越深,解套遥遥无期。; n5 n5 K' Q- g* D1 I

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' [4 r& {8 V" n& j0 W0 Q

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