The need for replication studies is discussed. A statistical procedure is explained for pooling the probabilities of a series of independent studies testing the same hypothesis. (DT)

This paper examines the differences between multilevel modeling and weighted ordinary least squares (OLS) regression for analyzing data from the National Educational Longitudinal Study 1988 (NELS:88). The final sample consisted of 718 students in 298 schools. Eighteen variables from the NELS:88 dataset were used, with the dependent variable being…

Creating a survey that asks the right questions at a level appropriate for the intended audience is a difficult task. This guide is designed to support educators who want to be confident that the data they gather will be useful. The guide is organized according to the developmental steps in creating a survey. Individual chapters correspond to the…

Suggests a possible research strategy for ensuring successful follow-up of respondents in longitudinal surveys. (TO)

Response to article PS 502 099. (MB)

The study concludes that the majority of research is focused on the diagnostic, descriptive, and psychometric problems of clinical psychology and not on decision making and treatment problems. (Author)

Recommends criteria related to statement of problem and hypotheses, choice of design, control of variables, analysis of data, and reporting of conclusions and implications in research studies. Bibliography. (MD)

Research supported in part by U.S. Public Health Service grant MH-16080.

Comments on the delayed treatment design are offered as an amendment to the Heath et al. discussion by pointing out two important assumptions of their recommended design, and tracing through implications of those assumptions for the interpretation of treatment effects. (Author/PN)

A general analysis strategy is proposed such that the universe of inference is increased incrementally. The strategy prevents logically incongruent findings that occasionally result when the conventional analysis strategy is employed. (Author)

Studies designed to assess the efficacy of interventions with organically impaired infants in terms of how well the experimental designs used controlled for threats to interval validity were analyzed. The use of methodologically more rigorous designs in evaluation studies is recommended to prevent or ameliorate the adverse effects of…

A weighted harmonic means analysis is presented that incorporates all of the available data, preserves the planned proportionality of the design, and avoids the problems associated with the replacement of missing data with sample estimates. (Author/BW)