期刊
ADVANCES IN METHODS AND PRACTICES IN PSYCHOLOGICAL SCIENCE
卷 5, 期 1, 页码 -出版社
SAGE PUBLICATIONS INC
DOI: 10.1177/25152459211054059
关键词
sample-size determination; power analysis; study design; open materials
In this tutorial, a web app and R package are introduced, providing nine different procedures to determine and justify the sample size for independent two-group study designs. Each procedure's most important decision points are highlighted, and example justifications are suggested.
Planning sample size often requires researchers to identify a statistical technique and to make several choices during their calculations. Currently, there is a lack of clear guidelines for researchers to find and use the applicable procedure. In the present tutorial, we introduce a web app and R package that offer nine different procedures to determine and justify the sample size for independent two-group study designs. The application highlights the most important decision points for each procedure and suggests example justifications for them. The resulting sample-size report can serve as a template for preregistrations and manuscripts.
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