Sample Size and Power
Sample Size and Power
Sample Size and Power
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Nonr<strong>and</strong>omized?<br />
• Non-r<strong>and</strong>omized studies looking<br />
for differences or associations<br />
– Require larger sample to allow<br />
adjustment for confounding factors<br />
• Absolute sample size is of interest<br />
– Surveys sometimes take % of<br />
Surveys sometimes take % of<br />
population approach
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