Understanding and Interpreting Effect Size Measures

• Published in: Social work research Vol. 31; no. 4; pp. 243 - 248
• Main Authors: LeCroy, Craig Winston, Krysik, Judy
• Format: Journal Article
• Language: English
• Published: Oxford Oxford University Press 01.12.2007; National Association of Social Workers
• Subjects: Applied statistics; Behavioral sciences; Control Groups; Educational research; Effect Size; Heart attacks; Indexes (Measures); Methodological Problems; Methodology (Data Analysis); Myocardial infarction; P values; Psychological counseling; Research methods; RESEARCH NOTE; Sample Size; Social sciences; Social work; Social Work Research; Standard deviation; Statistical Analysis; Statistical Significance; Studies; Task forces

A conclusion of no difference based on statistical significance testing might lead the researcher in the cancer drug study to stop his or her investigation, but a meaningful effect size might suggest just the opposite-the importance of replicating the study with a larger sample that is sufficiently...