Read e-book online Asymptotic Statistics PDF

By A. W. van der Vaart

ISBN-10: 0521496039

ISBN-13: 9780521496032

ISBN-10: 0521784506

ISBN-13: 9780521784504

Here's a useful and mathematically rigorous advent to the sector of asymptotic information. as well as lots of the commonplace themes of an asymptotics course--likelihood inference, M-estimation, the idea of asymptotic potency, U-statistics, and rank procedures--the publication additionally provides contemporary examine subject matters comparable to semiparametric versions, the bootstrap, and empirical strategies and their functions. the subjects are geared up from the imperative notion of approximation by means of restrict experiments, one of many book's unifying issues that more often than not includes the neighborhood approximation of the classical i.i.d. manage with gentle parameters by means of place experiments concerning a unmarried, quite often disbursed remark.

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If the distribution of X is uniquely determined by its moments, then Xn "-"+X. Proof. Because Ex; = 0 (1), the sequence Xn is uniformly tight, by Markov's inequality. By Prohorov's theorem, each subsequence has a further subsequence that converges weakly to a limit Y. By the preceding example the moments of Y are the limits of the moments of the subsequence. Thus the moments of Y are identical to the moments of X. Because, by assumption, there is only one distribution with this set of moments, X and Y are equal in distribution.

By definition of 4> this satisfies e(()) = 'fl· Any other 8 with e(8) = 'fl is also a fixed point of¢. In that case the difference = 4> (e) - 4> (e) has norm bounded by ! II e11. This can only happen if = e. Hence e is one-to-one throughout U. 4 Example. Let X 1, ... , Xn be a random sample from the beta-distribution: The common density is equal to + r(a {J) a-! {J-1 x 1-+ r(a)r({J) x (1 - x) 1o

N(~) = (1 +~ill-+ o(~) r--+ eit~. The right side is the characteristic function of the constant variable 11-· By Levy's theorem, Convergence in distribution to a constant is the same as convergence in probability. • Yn converges in distribution to 11-· A sufficient but not necessary condition for ~(t) = EeitY to be differentiable at zero is that ElY I < oo. y . y 1 = EiYe' 1 = -Ee' dt • In particular, the derivative at zero is 4>' (0) = iEY and hence Y n ~ EY1• If EY 2 < oo, then the Taylor expansion can be carried a step further and we can obtain a version of the central limit theorem.

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Asymptotic Statistics by A. W. van der Vaart

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