Heien and Wessells' two-step estimator for the multivariate sample-selection model has been used extensively during the past 15 years. A modified version of it, with slightly different selectivity regressors, has also appeared in the empirical literature. Both estimators are unfounded and...

The spatial structure of county-level agricultural production in China in 1999 is analysed. A convenient simple method that corrects for both spatial autocorrelation and spatial heterogeneity in the input-output relationships using spatial lag models and an allowance for the response...

A censored system of household fat and oil demand equations is estimated with a two-step procedure, using cross-sectional data from the 1987-1988 US Nationwide Food Consumption Survey. Own price and total expenditure elasticities are close to unity and there is no evidence of gross...

Censoring mechanisms and gender differences are investigated for cigarette consumption by individuals in the USA. The Gaussian single-hurdle model is proposed which generalizes the specifications of Cragg (1971) and Heckman (1979) and allows examination of the empirical relevance of the two...

Responding to mounting evidence of the association between whole-grain consumption and a reduced risk of heart problems and other diseases, as well as an increased probability of body weight maintenance, the US Government has strongly encouraged its citizens to increase consumption of whole...

Many previous studies of US cigarette and alcohol consumption have focused on single equations. However, the addictive nature of consumption suggests that it is more appropriate to model these products as a system. We propose a two-step estimation procedure and apply the procedure to a system of...

This study analyses the demand for cigarettes fitting observed zero outcomes with a trivariate model consisting of an equation for the starting smoking decision, an equation for the quitting decision, and an equation that models the level of cigarettes consumed. Five competing specifications are...

We investigate the effect of physical activity on bodyweight and the gender differences in such effects, following the copula approach to endogenous switching regression. Using data from the 2006 Behavioral Risk Factor Surveillance System (BRFSS), we find differentiated effects of...