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A Simple Test for Heterogeneity in Exponential Models of Duration

Journal of Labor Economics 1984 2(4), 539-549
This paper proposes a simple, new diagnostic indicating the presence of uncorrected heterogeneity in exponential models of duration. The use of the diagnostic is illustrated in an example dealing with unemployment duration in the DIME data. The diagnostic is seen to supplement the information on the fit given by the maximized likelihood value.

Measurement Error in the Prototypal Job-Search Model

Journal of Labor Economics 1994 12(4), 618-639
Statistical analysis of the job-search model has isolated the role played by the minimum observed wage in identifying and estimating behavioral parameters. Estimators based on order statistics, however, are influenced by measurement error in ways that estimators based on averages are not, and there is ample evidence that wage data contain measurement errors. We propose a model in which worker behavior is captured by the prototypal search model but wages are observed with error.