Considerations of Power, Effect Size, and Sample Size in the Planning and Analyses of Studies

Philippine Journal of Psychology

14 Pages Posted: 5 Jul 2009

See all articles by Carlo Magno

Carlo Magno

De La Salle University, Manila

Date Written: June 2007

Abstract

Despite availability of softwares, power analysis has not become standard practice among researchers in psychology. In this paper, the relationships among power, significance level, sample size, and effect size are discussed. Actual research data are used to illustrate that the power of a test is increased with an increase in effect size, a decrease in significance level, and an increase in sample size. Strategies for power analysis are described. Recommendations are discussed, including choosing a sample size that ensures adequate power for a planned study, pursuing research on effects with large magnitudes rather than with only small magnitudes, and reporting effect sizes to enable readers to better gauge the importance of research results.

Keywords: Power Analysis, Effect Size, Sample Size, Null Hypothesis Testing

Suggested Citation

Magno, Carlo, Considerations of Power, Effect Size, and Sample Size in the Planning and Analyses of Studies (June 2007). Philippine Journal of Psychology. Available at SSRN: https://ssrn.com/abstract=1429336

Carlo Magno (Contact Author)

De La Salle University, Manila ( email )

2401 Taft. Ave.
Manila, 4002
Philippines

Register to save articles to
your library

Register

Paper statistics

Downloads
95
Abstract Views
394
rank
276,498
PlumX Metrics