Abstract
This study offers a new approach to measure the adoption practices of right-to-work legislation by states over time. By allowing the dependent variable to represent the number of years a state has had the RTW legislation (with 1989 as the terminal year), the intensity of adoption can be modelled. This technique allows the cross-section to represent the year of adoption rather than a single year, and represents an effort to compare states in like circumstances (a measure of diffusion). Interestingly, the result fails to support the theory that unionization rates are significantly negatively related to the adoption practices, although the degree of a state's labour force engaged in both construction and manufacturing are important.