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Weak exogeneity in the financial point processes

Xu, Yongdeng 2013. Weak exogeneity in the financial point processes. [Working Paper]. Cardiff Economics Working Papers, Cardiff: Cardiff University.

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Abstract

This paper analyses issues related to weak exogeneity in a financial point process. We extend the Hausman test of weak exogeneity in a time series model and propose three cases in which weak exogeneity conditions will break down. The simulation study suggested that a failure of the exogeneity assumption implied biased estimators. The bias is very large in the third case non-weak exogeneity, which makes the econometric inferences on the parameters unreliable or even misleading. We then derive an LM test for weak exogeneity. The LM test is attractive because it only requires estimation of the restricted model. The empirical results indicate that the weak exogneity of duration is often rejected for frequently traded stocks, but is less likely to be rejected for infrequently traded stocks.

Item Type: Monograph (Working Paper)
Date Type: Publication
Status: Published
Schools: Business (Including Economics)
Subjects: H Social Sciences > HB Economic Theory
Publisher: Cardiff University
Date of First Compliant Deposit: 30 March 2016
Last Modified: 14 Feb 2018 12:24
URI: http://orca.cf.ac.uk/id/eprint/77991

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