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Saddlepoint expansions for conditional distributions

Published online by Cambridge University Press:  14 July 2016

Ib M. Skovgaard
Ib M. Skovgaard*
Affiliation:
Royal Veterinary and Agricultural University, Copenhagen
*
∗ Postal address: Royal Veterinary and Agricultural University, Department of Mathematics, Thorvaldsensvej 40, DK-1871 Frederiksberg C, Denmark.
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Abstract

A saddlepoint expansion is given for conditional probabilities of the form where is an average of n independent bivariate random vectors. A more general version, corresponding to the conditioning on a p – 1-dimensional linear function of a p-dimensional variable is also included. A separate formula is given for the lattice case. The expansion is a generalization of the Lugannani and Rice (1980) formula, which reappears if and are independent. As an example an approximation to the hypergeometric distribution is derived.

Keywords

CONDITIONAL PROBABILITYHYPERGEOMETRIC DISTRIBUTIONLATTICE VARIABLETAIL PROBABILITYUNIFORM SADDLEPOINT EXPANSION

Information

Type
Research Papers
Information
Journal of Applied Probability , Volume 24 , Issue 4 , December 1987 , pp. 875 - 887
Copyright
Copyright © Applied Probability Trust 1987 

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