This paper reports a study regarding households’ willingness to pay for private sector solid waste management services. The data originated from a contingent valuation survey conducted in 224 households in Ilorin in southwest Nigeria and was analysed using tobit and censored least absolute deviations models. The use of a robust and consistent estimator to model zero willingness to pay responses...

This paper presents the design of TOBIT, an infrastructure to support Web-based simulations. TOBIT provides a subnet grid, which is partitioned into web server tier, database server tier and simulation server tier. This grid is self-managed through the simulation manager (SimMan) extended from the Oracle Grid Control [3]. TOBIT is currently being used to support autonomic computing of two web-b...

Absenteeism research has often been criticized for using inappropriate analysis. Characteristics of absence data, notably that it is usually truncated and skewed, violate assumptions of OLS regression; however, OLS and correlation analysis remain the dominant models of absenteeism research. This piece compares eight models that may be appropriate for analyzing absence data. Specifically, this p...

This appendix contains additional analyses that we mention but do not report in the paper to preserve space.  Table IA.1: Cross-sectional gravity models (baseline equation (2)) on a sample that includes the natural resources industries.  Table IA.2: Cross-sectional gravity models (baseline equation (2)) with acquirer and target country fixed effects (instead of acquirer and target country cha...

This article explores the impact of English proficiency on labour supply of recent immigrants in Australia. Previous research has shown that English ability is important for participation and employment, however little research has been done with respect to hours worked. This study uses the second cohort of the Longitudinal Survey of Immigrants to Australia (LSIA) data to estimate a random effe...

When no discharge record is available for a site, a regional regression relationship can be used to estimate low-flow quantiles. Problems arise in the derivation of such models when some at-site quantile estimates are reported as zero. One concern is that quantile estimates reported as zero may be in the range from zero to the measurement threshold. A second concern is that a logarithmic transf...