Stratified partial likelihood estimation
When multiple durations are generated by a single unit, they may be related in a way that is not fully captured by the regressors. The omitted unit-specific variables might vary over the durations. They might also be correlated with the variables in the regression compenent. We propose an estimator that responds to these concerns and develop a specification test for detecting unobserved unit-specific effects.
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References listed on IDEAS
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