Demonstrates a statistically valid method allowing students to explore randomization. Described are two examples: counting techniques for a small set of data and simulation for a large sample. (YP)

Investigates the development of a perception of values in childhood. Perception of values is defined as being different than those of morality and conventions. Responses to seven scenarios are analyzed. Concludes that there is a distinct concept of values among children and that the instinct for this increases with age. (KO)

A pilot study involving 90 percent of the parents of 200 seventh graders attending two junior high schools evaluated the effectiveness of active versus passive methods of obtaining parental consent. Passive consent can provide a viable alternative to active consent when supplemented by appropriate backup and privacy safeguards. (TJH)

Presents the objective and methodology chosen for the construction of a global emissions source database called EDGAR and the structural design of the database system. The database estimates on a regional and grid basis, 1990 annual emissions of greenhouse gases, and of ozone depleting compounds from all known sources. (LZ)

Examines the potential for the replacement of CFCs for historic uses with substituting technologies. The potential production and emissions of the principal HCFCs and HFCs are calculated for the next 25 years. (LZ)

This meta-analysis found significant relationships between the experience of child sexual abuse and subsequent difficulties in psychological adjustment as measured by psychological symptomatology, depression, and self-esteem. Significant heterogeneity occurred across studies using different subject populations. Student samples consistently…

Describes advances in capture-recapture modeling, including the biologically motivated emphasis on model-based hypothesis testing and the development of models for spatially stratified populations. Discusses the severe problems associated with count statistics reflecting unknown sampling fractions. (67 references) (KR)

A method is proposed for constructing a population covariance matrix as the sum of a particular model plus a nonstochastic residual matrix, with the stipulation that the model holds with a prespecified lack of fit. The procedure is considered promising for Monte Carlo studies. (SLD)

Variance formulas of H. E. Daniels and M. G. Kendall (1947) are generalized to allow for the presence of ties and variance of the sample tau correlation. Applications of these generalized formulas are discussed and illustrated using data from a 1965 study of contraceptive use in 15 developing countries. (SLD)

This study found that accuracy in predicting the out-of-home placement of children with severe disabilities increased little in a large cross-sectional sample (n=5,992) over a smaller semilongitudinal sample (n=141). Factors such as age, adaptive and maladaptive behavior, and ethnicity are discussed. (Author/JDD)

Issues concerning the selection of judges for standard setting are discussed. Determining the consistency of judges' recommendations, or their congruity with other expert recommendations, would help in selection. Enough judges must be chosen to allow estimation of recommendations by an entire population of judges. (SLD)

Evidence is presented on the generalizability and convergent validity of performance assessments using data from six studies of student achievement that sampled a wide range of measurement facets and methods. Results at individual and school levels indicate that task-sampling variability is the major source of measurement error. (SLD)

The Experience Sampling Method (ESM; Larson & Csikszentmihalyi, 1983) is a means to investigate the subjective experiences of individuals as they go about their daily lives. Students from 2 Adolescent Psychology courses used the ESM in a required "beeper project." Student research teams investigated a typical week in the life of an adolescent by…

A content analysis of 20 student conduct codes identified through stratified random sampling was performed to determine the extent to which legal terminology had been eliminated, as suggested by judicial affairs experts. The results showed that 80% of the codes selected in this study still contained some legal terms. These words and phrases are…

Pitfall trap sampling of Carabid beetle species on roundabouts in Bracknell, Berkshire, was used to assess the biodiversity of this taxon by its use as an indicator. The aim of the study was to discover the role of traffic islands in the provision of refugia for invertebrate fauna in fragmented urban habitats. Sampling was performed on 15…