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Power, precision, and sample size estimation in sport and exercise science research
Abt, Grant Boreham, Colin Davison, Gareth Jackson, Robin Nevill, Alan Wallace, Eric Williams, Mark
Abt, Grant
Boreham, Colin
Davison, Gareth
Jackson, Robin
Nevill, Alan
Wallace, Eric
Williams, Mark
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Epub Date
Issue Date
2020-06-19
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Abstract
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: 10.1080/02640414.2020.1776002
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PubMed ID
32558628 (pubmed)
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Type
Journal article
Language
en
Description
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.
Series/Report no.
ISSN
0264-0414
EISSN
1466-447X