Electronic Journal of Probability

A Cramér Type Theorem for Weighted Random Variables

Jamal Najim

Abstract

A Large Deviation Principle (LDP) is proved for the family $(1/n)\sum_1^n f(x_i^n) Z_i$ where $(1/n)\sum_1^n \delta_{x_i^n}$ converges weakly to a probability measure on $R$ and $(Z_i)_{i\in N}$ are $R^d$-valued independent and identically distributed random variables having some exponential moments, i.e., $$E e^{a |Z|} \lt \infty$$ for some $0 \lt a \lt \infty$. The main improvement of this work is the relaxation of the steepness assumption concerning the cumulant generating function of the variables $(Z_i)_{i \in N}$. In fact, Gärtner-Ellis' theorem is no longer available in this situation. As an application, we derive a LDP for the family of empirical measures $(1/n) \sum_1^n Z_i \delta_{x_i^n}$. These measures are of interest in estimation theory (see Gamboa et al., Csiszar et al.), gas theory (see Ellis et al., van den Berg et al.), etc. We also derive LDPs for empirical processes in the spirit of Mogul'skii's theorem. Various examples illustrate the scope of our results.

Article information

Source
Electron. J. Probab., Volume 7 (2002), paper no. 4, 32 pp.

Dates
Accepted: 12 October 2001
First available in Project Euclid: 16 May 2016

https://projecteuclid.org/euclid.ejp/1463434877

Digital Object Identifier
doi:10.1214/EJP.v7-103

Mathematical Reviews number (MathSciNet)
MR1887624

Zentralblatt MATH identifier
1011.60005

Subjects
Primary: 60F10: Large deviations
Secondary: 60G57: Random measures

Rights

Citation

Najim, Jamal. A Cramér Type Theorem for Weighted Random Variables. Electron. J. Probab. 7 (2002), paper no. 4, 32 pp. doi:10.1214/EJP.v7-103. https://projecteuclid.org/euclid.ejp/1463434877

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