Articles published in several prominent educational journals were examined to investigate
the use of data analysis tools by researchers in four research paradigms: between-subjects …

This review examines recent advances in sample size planning, not only from the
perspective of an individual researcher, but also with regard to the goal of developing …

The sample size necessary to obtain a desired level of statistical power depends in part on
the population value of the effect size, which is, by definition, unknown. A common approach …

Abstract G* Power (Erdfelder, Faul, & Buchner, 1996) was designed as a general stand-
alone power analysis program for statistical tests commonly used in social and behavioral …

GPOWER is a completely interactive, menu-driven program for IBM-compatible and Apple
Macintosh personal computers. It performs high-precision statistical power analyses for the …

Designing Experiments and Analyzing Data: A Model Comparison Perspective (3rd edition)
offers an integrative conceptual framework for understanding experimental design and data …

Underpowered studies persist in the psychological literature. This article examines reasons
for their persistence and the effects on efforts to create a cumulative science. The" curse of …

The purpose of this paper is to promote statistical power analysis in the behavioral sciences
by introducing the easy to use GPower software. GPower is a free general power analysis …

Despite the development of procedures for calculating sample size as a function of relevant
effect size parameters, rules of thumb tend to persist in designs of multiple regression …

Ecological research and the way that ecologists use statistics continues to change rapidly.
This second edition of the best-selling Design and Analysis of Ecological Experiments leads …