Articlebronze1974

Transformation of Local Martingales Under a Change of Law

97 citations0/0 files storedThe Annals of Probability

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Stochastic processes and financial applications Probability and Statistical Research Stochastic processes and statistical mechanics

Abstract

Girsanov showed that under an absolutely continuous change in probability measure a Wiener process is transformed into the sum of a Wiener process and a second process with sample functions which are absolutely continuous. This result has a natural generalization in the context of local martingales. This generalization is derived in this paper, and some of its ramifications are examined. As a simple application, the likelihood ratio for a single-server queueing process with very general arrival and service characteristics is derived.

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