statistical power


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sta·tis·ti·cal pow·er

in Neyman-Pearson hypothesis testing, the probability of rejecting the null hypothesis when it is false; the complement of an error of the second kind.

statistical power

probability that a statistical test will reject a false null hypothesis (i.e. that it will not make a type II error)
  • a priori power analysis use of the power calculation from pilot study data, to determine main study sample size

  • post-hoc power analysis use of the power equation from the main study data to determine the power of the study

References in periodicals archive ?
Third, low statistical power and confounding effects combine to generate sizeable upward bias in detected price impacts and damages (i.
In comparison, when [rho] [not equal to] 1, longitudinal studies always provide more statistical power than their cross-sectional counterparts.
content analysis has a sample size of journal articles, not of human participants; Q methodology requires a small sample size), and neither methodology requires the calculation of psychometrics of instrumentation or statistical power.
This critical influence of the unbalanced designs on statistical power could be strengthened by the study of Wang et al.
It shall also be taken into consideration that to have high statistical power in a test, the power shall be 0.
Finally, power values were low for both confidence intervals and more studies are needed to improve statistical power.
This study summarizes and analyzes average statistical power and effect sizes in empirical entrepreneurship research.
As it happens, the effect size of interest is a mandatory variable in any a priori calculation of statistical power, along with the expected sample standard deviation (2-4).
Also, small businesses are unlikely to obtain statistical significance via criterion-related validation because of their small sample sizes and the resulting loss of statistical power.
Cohen takes an accessible, conversation approach when introducing the conceptual foundations and basic of statistic procedures, a practice he continues with material on frequency tables, graphs, distributions, measures of central tendency and variability, standardized scores and the normal distribution, hypothesis testing with one or two samples, internal estimation and the t distribution, the t test for two independent sample means, statistical power and effect size, linear correlation and regression, the matched t test, one-way independent ANOVA and two-way ANOVA, multiple regression and its connection to ANOVA, nonparametric statistics, chi-square tests and statistical tests for ordinal data.
FEATURES: The book includes discussion of following topics in nine chapters: measurement in the laboratory and in the field, motion analysis using video and on-line systems, measurement of force and pressure, measurement of muscle strength using isokinetic dynamometry, electromyography, computer simulation and modeling of human movement, data processing and data smoothing and research methodologies regarding sample size and variability effects on statistical power.
The current study was designed to have greater statistical power and analyzed data on over 30,000 patients attending 454 general practices in the United Kingdom between 1995 and 2005.

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