Studies of homeless individuals typically sample subjects from few types of sites or regions within a metropolitan area. This article focuses on the biases that can result from such a practice. We obtained a probability sample of 419 homeless youth from 41 sites (shelters, drop-in centers, and streets) in four regions of Los Angeles County (LAC).…

There is unexamined potential for developing and testing rival causal explanations in the type of data that participant observation is best suited to create: descriptions of in situ social interaction crafted from the participants' perspectives. By intensively examining a single ethnography, we can see how multiple predictions can be derived from…

Much of the currently available evidence on the causal effects of public prekindergarten programs on school readiness outcomes comes from studies that use a regression-discontinuity design (RDD) with the age cutoff to enter a program in a given year as the basis for assignment to treatment and control conditions. Because the RDD has high internal…

Reactions of neural, psychological, and social systems are rarely, if ever, independent of previous inputs and states. The potential for serial order carryover effects from one condition to the next in a sequence of experimental trials makes counterbalancing of condition order an essential part of experimental design. Here, a method is proposed…

Mel Pollner regularly cautioned researchers not to argue with the members of settings under consideration. He warned against substituting the researcher's meaning for the meanings of those being studied. This article discusses facets of the caution as they relate to the research process. Seemingly simple, the tenet is nuanced in application. The…

The research design of a study involves continual refinement through experiential processes. This case study demonstrates the importance to novice researchers of conducting a pilot study to test the feasibility of the study's research design and practice data collection (in this instance, interviewing skills). The case study is based on an…

Bui, Craig, and Imberman assessed the impact of gifted and talented programs on student achievement using regression discontinuity and random assignment to gifted magnet schools. In both analyses, they found minimal impact of the gifted and talented programs on student achievement. This commentary addresses two concerns associated with the study.…

The purpose of this article is to inform researchers about and encourage the use of longitudinal designs to further understanding of human resource development and organizational theory. This article presents information about a variety of longitudinal research designs, related statistical procedures, and an overview of general data collecting…

This paper explores some of the difficulties of doing research concerning young people's use of online sexually explicit materials in three high schools in South Africa. Against the backdrop of young people's sexual agency, we elaborate on the ways in which getting permission to conduct the research unsettled gatekeepers, as research on young…

Evaluators of education interventions are increasingly designing studies to detect impacts much smaller than the 0.20 standard deviations that Cohen (1988) characterized as "small." While the need to detect smaller impacts is based on compelling arguments that such impacts are substantively meaningful, the drive to detect smaller impacts…

We offer an introduction to the five papers that make up this special section. These papers deal with a range of the methodological challenges that face researchers analyzing fMRI data--the spatial, multilevel, and longitudinal nature of the data, the sources of noise, and so on. The papers all provide analyses of data collected by a multi-site…

Aims and objectives: The importance of childhood physical activity is widely recognised. Helping children to articulate their opinions is a crucial factor in improving their health and well-being, yet the field is predominantly focused on adult-led quantitative methods and lacks deeper understanding from a child perspective. Methods: This paper…

Including all children in large-scale educational studies is a pressing concern. Omitting certain types of children from studies can lead to skewed findings that promote inaccuracies about learning levels or educational quality. Increasingly, assessments are a method for investigating the quality of education systems, but national assessments are…

The investment of decision makers in research can increase the likelihood that relevant and timely practice-based research questions are asked and that these findings are readily taken up into policy and practice. While many positive benefits may be gained from this type of research, various challenges may also arise along the way. These include:…

When doing research, or for that matter working in school-age childcare, the researcher/teacher is required to develop a plan for her/his work in spite of knowing that unexpected things will happen. This article aims to explore the relationship between the process of planning and unexpected events in childcare practice and action research. The…