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Only the first term of some series counts
Authors:Aurel Sp?taru
Institution:
  • Institute of Mathematical Statistics and Applied Mathematics, Romanian Academy, Calea 13 Septembrie, nr 13, 76100 Bucharest 5, Romania
  • Abstract:Let X,X1,X2,… be i.i.d. random variables, and set Sn=X1+?+Xn. We prove that for three important distributions of X, namely normal, exponential and geometric, series of the type ∑n≥1anP(|Sn|≥xbn) or ∑n≥1anP(Snxbn) behave like their first term as x.
    Keywords:Tail probabilities of sums of i  i  d  random variables  Normal distribution  Exponential distribution  Geometric distribution
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