We consider the case of a community intervention trial evaluated with a series of cross-sectional surveys and having outcomes measured on an ordinal scale. We propose a modelling procedure that combines ridit analysis and linear regression methods. We use the multinomial distribution as the basis for variance estimation of the mean ridits and then use simple regression models to estimate differences (for example, between intervention and comparison areas) among the ridits. We illustrate this procedure with data from a community intervention trial promoting condom use, with the adoption of consistent condom use measured on a 5-point ordinal scale.
This study focuses on the relationship between patterns of primary drug abuse during 1976 for heroin, marijuana, cocaine, and amphetamines across the demographic variables of age at first use, education, race/ethnic, and sex. A sample of 162,062 clients was selected. Findings indicate that marijuana usage followed by heroin, amphetamines, and cocaine is the most common pattern for clients whose age at first use is 15. Clients with an age at first use of 16 show a pattern of heroin followed by marijuana, amphetamines, and cocaine. Blacks abuse heroin to a greater extent that either White or Spanish-speaking clients.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.