Current practice for conducting power analyses in hierarchical trials using survey based ICC and effect size estimates may be misestimating power because ICCs are not being adjusted to account for treatment effect heterogeneity. Results presented in Table 1 show that the necessary adjustments can be quite large or quite small. Furthermore, power…

Researchers designing multisite and cluster randomized trials of educational interventions will usually conduct a power analysis in the planning stage of the study. To conduct the power analysis, researchers often use estimates of intracluster correlation coefficients and effect sizes derived from an analysis of survey data. When there is…

Data collected from surveys can result in hundreds of variables and thousands of respondents. This implies that time and energy must be devoted to (a) carefully entering the data into a database, (b) running preliminary analyses to identify any problems (e.g., missing data, potential outliers), (c) checking the reliability and validity of the…

Fundamentally concerned with motivation, self-determination theory (SDT) represents a framework of several mini-theories to explore how social context interacts with people's motivational types categorized by degree of regulation internalization. This paper aims to modify an existing theory-based instrument (Academic Motivation Scale, or AMS) and…

The purpose of the study was to use model-based clustering to identify adolescent time attitude profiles in a sample of students from an urban high school using Adolescent Time Inventory-Time Attitude (ATI-TA) scores and to examine the association of ATI-TA profiles with demographic variables and grade point average (GPA). Three ATI-TA profiles…

Drawing upon a sample of 13,025 students who attended the nine majority minority colleges of the Los Angeles Community College District, this study examined the interaction effects of the racial composition of the colleges on student persistence. Special attention was given to variables that paired students' race to the racial demography of the…

Title IX was enacted over 40 years ago, and although there have been marked increases in the number of girls and women participating in athletics at every level, gender equity in athletics continues to be a concern. This is especially evident at the community college level. Title IX requires equity in the areas of opportunities for participation,…

Using cluster analysis, 717 students who reported that they had never smoked and the nondrinking 292 students who reported that they had never drank alcohol were classified into four profile groups based on their Pros and Cons of not using and temptation to use. Profiles were labeled Most Protected, Least Positive, Most Negative, and Most Tempted.…

Purpose: The purpose of this mixed methods study was to investigate the best practices for bullying interventions. The participants for the quantitative data collection were counselors (n = 22) and principals (n = 20) located in elementary and junior high schools; 10 were selected to participate in the qualitative data collection. Method: The…

Nonsuicidal self-injury is an important concern that has received limited attention. In this study, the authors explored several factors differentiating three student groups: never self injured, self-injured in the past, and currently self-injure. Among the factors investigated, results showed that currently self-injuring students were younger,…