Gene V. Glass

Primary, Secondary, and Meta-Analysis of Research

The benefits of psychotherapy

Meta-analysis of psychotherapy outcome studies.

Results of nearly 400 controlled evalua- tions of psychotherapy and counseling were coded and integrated statistically. The findings provide convincing evidence of the efficacy ...

Note on Rank Biserial Correlation

variables, n consecutive ranks, a dichotomy, a trichotomy, etc. In this paper we shall be concerned with developing a measure of the correlation between one variable comprising ...

Foundations of the Theory of Prediction

Meta-Analysis of Research on Class Size and Achievement

THERE IS No POINT IN RECORDING THE obvious about class size: that teachers worry about it more than nearly anything else, that administrators want to increase it, that it is eco...

Meta-analysis of research on the relationship of class-size and achievement

Primary, Secondary, and Meta-Analysis of Research