Transcription of Sample Size Planning, Calculation, and Justification
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Sample Size Planning, Calculation, and Justification
Sample size planning , calculation , and Justification Theresa A Scott, MS. Vanderbilt University Department of Biostatistics Theresa A Scott, MS (Vandy Biostatistics) Sample size 1 / 24. Introduction . After you've decided what and whom you're going to study and the design to be used, you must decide how many subjects' to Sample . Even the most rigorously executed study may fail to answer its research question if the Sample size is too small. If the Sample size is too large, the study will be more difficult and costly than necessary while unnecessarily exposing a number of subjects' to possible harm.. Goal: to estimate an appropriate number of subjects' for a given study design.
Calculating sample size for analytic studies, cont’d.The Chi-square-test: Commonly used to determine whether the proportion of ‘subjects’ who have a binary outcome variable in one group
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