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2016 ; 2016
(ä): 8920418
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English Wikipedia
Causality in Statistical Power: Isomorphic Properties of Measurement, Research
Design, Effect Size, and Sample Size
#MMPMID27073717
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Scientifica (Cairo)
2016[]; 2016
(ä): 8920418
PMID27073717
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Statistical power is the ability to detect a significant effect, given that the
effect actually exists in a population. Like most statistical concepts,
statistical power tends to induce cognitive dissonance in hepatology researchers.
However, planning for statistical power by an a priori sample size calculation is
of paramount importance when designing a research study. There are five specific
empirical components that make up an a priori sample size calculation: the scale
of measurement of the outcome, the research design, the magnitude of the effect
size, the variance of the effect size, and the sample size. A framework grounded
in the phenomenon of isomorphism, or interdependencies amongst different
constructs with similar forms, will be presented to understand the isomorphic
effects of decisions made on each of the five aforementioned components of
statistical power.