Today I want to talk about effect sizes such as Cohen’s d, Hedges’s g, Glass’s Δ, η2, and ω2. Effects sizes concern rescaling parameter estimates to make them easier to interpret, especially in terms of practical significance.
Many researchers in psychology and education advocate reporting of effect sizes, professional organizations such as the American Psychological Association (APA) and the American Educational Research Association (AERA) strongly recommend their reporting, and professional journals such as the Journal of Experimental Psychology: Applied and Educational and Psychological Measurement require that they be reported. Read more…
There’s a new release of Stata. You can order it now, it starts shipping on June 24, and you can find out about it at www.stata.com/stata13/.
Well, we sure haven’t made that sound exciting when, in fact, Stata 13 is a big — we mean really BIG — release, and we really do want to tell you about it.
Rather than summarizing, however, we’ll send you to the website, which in addition to the standard marketing materials, has technical sheets, demonstrations, and even videos of the new features.
And all 11,000 pages of the manuals are now online.
Categories: New Products BLOBs, effect sizes, endogenous treatment effects, forecasts, generalized SEM, Java plugins, long strings, multilevel mixed-effects, power, Project Manager, random-effects panel data, sample size, treatment effects