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Specification tests with weak and invalid instruments


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Doko Tchatoka, F 2012 , Specification tests with weak and invalid instruments.

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Available under University of Tasmania Standard License.


We investigate the size of the Durbin-Wu-Hausman tests for exogeneity when instrumental variables violate the strict exogeneity assumption. We show that these tests are severely
size distorted even for a small correlation between the structural error and instruments. We then propose a bootstrap procedure for correcting their size. The proposed bootstrap procedure does not require identification assumptions and is also valid even for moderate correlations between the structural error and instruments, so it can be described as robust to both weak and invalid instruments.

Item Type: Report (Discussion Paper)
Authors/Creators:Doko Tchatoka, F
Keywords: Exogeneity tests; weak instruments; instrument endogeneity; bootstrap technique; RePec
Publisher: University of Tasmania
Additional Information:

Discussion Paper 2012-06 - Copyright 2012 University of Tasmania

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