The present paper, which is intended for a diverse audience of evaluation researchers, applied social scientists, and research funders, provides a broad overview of the conceptual and statistical issues involved in using multisite randomized trials to learn "about" and "from" variation in program effects across…

Quantitative behaviour analysis requires the classification of behaviour to produce the basic data. This can be challenging when the theoretical taxonomy does not match observational limitations, or if a theoretical taxonomy is unavailable. Binary keys allow qualitative observation to be used to modify a theoretical taxonomy to produce a practical…

In response to Hallahan et al, the authors suggest that variability in prevalence is a function of the methods used to examine prevalence differences and that the effect specific discrepancy criteria for learning disabilities have on the number of students identified is the critical issue. (Author/DB)

This population study of eight California birth cohorts (1987-1994) examined the degree to which improvements in detection and changes in diagnosis contribute to the observed increase in autism prevalence from 5.8 to 14.9 per 10,000. A decreasing prevalence of mental retardation without autism suggests that improvements in detection and changes in…

When 43 experienced school psychologists were asked to evaluate discrepancy scores, it was found that they made inconsistent choices, failed to use standard statistical procedures for testing differences between scores, and tended to misinterpret percentile ranks as useful for discrepancy analysis. Implications for learning-disabilities…

Three studies examined subtest profiles of the Kaufman Assessment Battery for Children: the first developed a normative taxonomy of subtest patterns using cluster analysis; the second compared subtest patterns of children with various disabilities; and the third used core patterns to identify children with unusual patterns. Results opposed the…

Empirical validation of the Self-Identity Development Model of Oppressed People (SIDMOP) prompted the choice of a multi-methodological approach that would test the underlying theory and not the participants' ability to perform a matching task. Few identity developmental models of oppressed people have been systematically developed, and even fewer…

The proposal put forward in this presentation centers on the use of the microcomputer for the generation of educational research, both as a powerful tool for information collection and as a means for analyzing the generated data. The microcomputer-based laboratory (MBL) principles described in this paper may be used in rural classroom settings as…

The purpose of this report was to explore one way in which quantitative and qualitative paradigms in program evaluation can be employed to reinforce each other. An evaluation was conducted of a large number of special education programs for preschoolers with handicaps in Louisiana. Since 1978, Louisiana has funded programs in 65 public school…