Scandinavian Working Papers in Economics

Working Paper Series,
Research Institute of Industrial Economics

No 62: Missing Variables and Two-Stage Least-Squares Estimation from More than One Data Set

Anders Klevmarken
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Anders Klevmarken: University of Gothenburg

Abstract: In a situation when no single sample inc1udes all the endogenous variables of a simultaneous equation model but there are two (or more) non-overlapping samples and each variable is included in at least one, then it is possible to pool the data and estimate the model consistently by a two-stage least-squares procedure. The asymptotic variances of the estimates are not always larger than those which would have been obtained with TSLS from one complete sample. It is also shown that under certain assumptions the same approach can be applied to an ordinary regression model.

Keywords: TLSL; Statistical modeling

JEL-codes: C10

19 pages, April 1982

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