Power, precision, and sample size estimation in sport and exercise science research
Authors
Abt, GrantBoreham, Colin
Davison, Gareth
Jackson, Robin
Nevill, Alan
Wallace, Eric
Williams, Mark
Issue Date
2020-06-19
Metadata
Show full item recordAbstract
The majority of papers submitted to the Journal of Sports Sciences are experimental. The data are collected from a sample of the population and then used to test hypotheses and/or make inferences about that population. A common question in experimental research is therefore “how large should my sample be?”. Broadly, there are two approaches to estimating sample size – using power and using precision. If a study uses frequentist hypothesis testing, it is common to conduct a power calculation to determine how many participants would be required to reject the null hypothesis assuming an effect of a given size is present. That is, if there’s an effect of the treatment (of given size x), a power calculation will determine approximately how many participants would be required to detect that effect (of size x or larger) a given percentage of the time (often 80%). Power calculations as conducted in popular software programmes such as G*Power (Faul et al., 2009) typically require inputs for the estimated effect size, alpha, power (1 – ᵦ), and the statistical tests to be conducted. All of these inputs are subjective (or informed by previous studies) and up to the researcher to decide the most appropriate balance between type 1 error rate (false positive), type 2 error rate (false negative), cost, and time. In contrast, estimating sample size via precision involves estimating how many participants would be required for the frequentist confidence interval or Bayesian credible interval resulting from a statistical analysis to be of a certain width. The implication is that a narrower confidence interval or credible interval allows a more precise estimation of where the “true” population parameter (e.g., mean difference) might be.Citation
Abt, G., Boreham, C., Davison, G., Jackson, R. et al. (2020) Power, precision, and sample size estimation in sport and exercise science research, Journal of Sports Sciences. DOI: 10.1080/02640414.2020.1776002Publisher
Informa UK LimitedJournal
Journal of Sports SciencesPubMed ID
32558628 (pubmed)Additional Links
https://www.tandfonline.com/doi/full/10.1080/02640414.2020.1776002Type
Journal articleLanguage
enDescription
This is an accepted manuscript of an article published by Taylor and Francis in Journal of Sports Sciences on 19/06/2020, available online: https://doi.org/10.1080/02640414.2020.1776002 The accepted version of the publication may differ from the final published version.ISSN
0264-0414EISSN
1466-447Xae974a485f413a2113503eed53cd6c53
10.1080/02640414.2020.1776002
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