We show that two commonly employed estimation procedures to deal with correlated unobserved heterogeneity in panel data models, within-groups and first-differenced OLS, can lead to very different estimates of treatment effects when these are not constant over time and treatment is a state that...

We show that two commonly employed estimation procedures to deal with correlated unobserved heterogeneity in panel data models, within-groups and first-differenced OLS, can lead to very different estimates of treatment effects when these are not constant over time and treatment is a state that...

Background: Health care is a labour-intensive industry and nursing represents a high proportion of these labour costs. In response to fiscal constraints, payers have attempted to constrain costs; in return, provider organizations have sought to reduce their labour costs by shifting from...

We use data from indexed and nonindexed Canadian wage agreements to study the intracontract profile of nominal and real wages. Allowing for endogenous switching between the two indexation categories, we conclude that the number of nominal wage revisions depends on contract duration, expected...