Stratified random sampling at differential rates is commonly used in social science surveys to improve the chances of getting sufficiently large samples of subpopulations of interest. Multi-phase sampling is often used to further target desired populations. The variances of such samples can be estimated using jackknifing, which creates replicated values of the characteristic of interest as if o...

Background: About 190 million people consume drugs and alcohol worldwide with the majority of this number being the youth. In Zambia the consumption of alcohol and other drug abuse is on the increase with the majority of youths starting to consume alcohol at an early age. Objectives: Aim of this paper is to explore the usage of alcohol and tobacco among University of Zambia students and factors...

This investigation of gendered experiences in computer science and computer engineering (CSE) doctoral programs uses survey data from a nationwide stratified random sample. Analyses of data from 41 departments show that women CSE doctoral students have less confidence than men students that they can achieve their educational goals. Moreover, women’s confidence is significantly affected by their...

Objective: The authors examined the incidence of stalking victimization and subsequent help-seeking behaviors among college women. Participants and Methods: A stratified random sample of college women (N = 391) completed an anonymous Internet-based questionnaire in spring 2006. Results: One-fifth of women reported stalking victimization while enrolled at their current institution. Individuals k...