Meta-analyses are becoming a popular tool for supporting benefit transfers, but the availability of studies is a direct consequence of policy issues, research funding, and investigator interest. We investigate fragility versus robustness of the meta-equation by considering sample selection,...

Estimation of economic relationships often requires imposition of constraints such as positivity or monotonicity on each observation. Methods to impose such constraints, however, vary depending upon the estimation technique employed. We describe a general methodology to impose...

We analyse a sample of airline firms most recently examined by Alam and Sickles (2000) and extended by Good, Sickles and Weiher (2005) to include an index of circuity as one of our measures of service quality of airline travel. An additional measure of quality of airline travel is timeliness and...

In this paper we review a number of analytical mothods and issues related to identifying and estimating the source of productivy growth.