Joint Estimation of Catch and Other Travel-Cost Parameters—Some Further Thoughts

E. R. Morey and D. M. Waldman propose and use an estimator that jointly estimates catch rates and the parameter on those catch rates. It is designed for situations where there is limited catch data for some of the sites in the choice set and takes advantage of the fact that trip patterns reflect variations in catch rates: anglers do not like to fish at sites with few fish. K. Train, D. McFadden, and R. Johnson note that this estimator is particularly sensitive to omitted variable bias and suggest an alternative estimator, but their estimator effectively eliminates poor sites from the choice set.