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Record: oai:ARNO:315925

AuthorJ. Niemczyk
TitleConsequences and detection of invalid exogeneity conditions
PromotorJ.F. Kiviet
PublisherThela Thesis
Pagesxi, 189
ISBN978 90 361 0143 1
FacultyFaculty of Economics and Business
Institute/dept.FEB: Tinbergen Institute
Keywordsinvalid instruments ; instruments selection ; exogeneity conditions ; overidentifying restriction tests
AbstractEstimators for econometric relationships require observations on at least as many exogenous variables as the model has unknown coefficients. This thesis examines techniques to classify variables as being either exogenous or endogenous, and investigates the consequences of invalid classifications. Various sequential classification procedures are being designed such that they are still feasible when there is an abundance of candidate exogenous instrumental variables. The performance in finite samples of such procedures, also when enhanced by bootstrapping, is found to be rather limited. Hence, failure to detect endogeneity and thus adopting invalid exogeneity conditions may occur frequently, which increases the relevance of studying its consequences. These are assessed by simulation and approximated by obtaining the asymptotic distribution in linear models of inconsistent estimators. This approximation is found to be very accurate if the actually exploited exogeneity is not very weak and it results in the remarkable finding that inconsistent least-squares estimators may often be more attractive than consistent instrumental variables estimators. To what degree all these procedures and theoretical findings can support and improve actual empirical inference is illustrated by analyzing cross-sectional data on the effects of schooling on earnings.
NoteTinbergen Institute research series no. 462
Document typeDissertation
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