This paper describes how work by the United States Office of Personnel Management on the generalizability of employment test validities led to the development of a widely applicable meta-analysis method. The method focuses strongly on estimating the true variance of study correlations and effect size. This validity generalization procedure has…

Research on the emergence of sex differences in spatial ability during early adolescence prompted a meta-analysis of 172 spatial ability studies conducted since 1974. The meta-analysis confirmed that there are actually several spatial abilities, that some types of spatial ability show marked sex differences while others show none, and that spatial…

Results of 120 studies were combined by meta-analysis to determine effects on mathematics test performance of factors other than knowledge of content. Conditions that enhanced performance included testwiseness training, praise, word problem pictures, and frequent testing. Conditions depressing or not affecting performance were also noted. (MNS)

Relates the development of theories concerning gender differences in mental ability and reexamines them using meta-analysis. Finds that the greatest difference is in one type of spatial ability, mental rotation. There is only a small difference in mathematical performance, and no difference in verbal ability. (DM)

A review of 25 studies found that demonstrations of successful generalization of skills by persons with profound mental handicaps were characterized by: several trained exemplars, trained behaviors likely to be reinforced in natural settings by natural consequences, use of training stimuli common to the generalization setting, and training in…

A meta-analysis of 53 studies on social skills training of children with learning disabilities found a mean effect size of only 0.211, with few differences among teachers, peers, or children themselves who judged the effectiveness of the training. Discussion focuses on possible links between learning disabilities and social skills that might…

Monte Carlo studies explored the sampling characteristics of Cohen's d and three approximations to Cohen's d when used as average effect size measures in meta-analysis. Reviews of 10, 100, and 500 studies (M) were simulated, with degrees of freedom (df) varied in seven steps from 8 to 58. In a two independent groups design, samples were obtained…

The meta analysis examined the ecological validity of 241 research studies concerned with changes in targeted behaviors in the moderately or profoundly retarded or autistic. Analysis of setting (least restrictive or not), maintenance, generalization, and social validity of procedures and outcomes indicated only a slight trend toward increased…

Differences between father-absent and father-present samples were not large. Although study quality was not the best predictor of outcome, the best-quality studies produced nonsignificant estimates of effect size. Most effect-size estimates were less than .5; many were much smaller. (RH)

Integrated quantitatively the collective research dealing with the effects of the Intermediate Science Curriculum Study (ISCS) on student performance and attitude. The weighted mean effect size was 0.09, indicating that the performance of ISCS students was 0.09 standard deviations about the performance of students in traditional science courses.…

This study is a synthesis of practice and research related to use of behavior analysis to train teachers. An idealized model for training science teachers is presented with research related to the model categories reviewed and analyzed. Results (based on meta-analysis) which support the idealized model are presented and discussed. (Author/JN)

Meta-analysis of the effects of 11 types of psychologically based organizational interventions showed that such programs raise worker productivity. The strength of effects vary by type of intervention, criterion of productivity, contextual factors in organizations, and features of research design. Also discussed are comparisons of conclusions…

A meta-analysis of 26 studies shows that accelerated gifted students outperform students of the same age and ability who are not accelerated and achieve as well as equally gifted older students in the higher grades. Correlational studies suggest that accelerates are equally successful later in life. (MLF)

Meta-analysis of 482 empirical studies on treatment of problem behaviors of individuals with mental retardation found that externally destructive behaviors are less successfully treated than socially disruptive and internally maladaptive behaviors. Also, response contingent procedures were significantly more effective than other procedures.…

Analysis of 117 research articles reporting use of behavioral interventions with single subjects with autism concluded that behavioral treatments are effective in reducing problematic behaviors. Type of target behavior and type of treatment did not moderate average treatment effect. Reliability of observation, number of treatment data points, and…