Power, Sample Size, Effect Size: Considerations for Research
[Pages:30]Power, Sample Size, Effect Size: Considerations for Research
Carol B. Thompson JH Biostatistics Center SON Brown Bag ? November 20, 2012
Research Approaches
? Comparisons ? statistical hypotheses ? Estimates ? precision (confidence intervals)
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Population vs Research Views
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Type I and Type II Errors (Which is Worse Risk?)
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Related Parameters for Prospective Analysis
? Effect Size ? Sample Size ? ? Power (1-)
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Parameters for and
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vs
? doesn't rely on any of the other parameters ? or power relies on 3 parameters (N, , ES)
? Which relate to a specific HA
? For same sample size and ES, lower higher
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Comparing Two Means
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