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1 - Introduction to effect sizes

Published online by Cambridge University Press:  05 June 2012

Paul D. Ellis
Affiliation:
Hong Kong Polytechnic University
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Summary

The primary product of a research inquiry is one or more measures of effect size, not p values.

~ Jacob Cohen (1990: 1310)

The dreaded question

“So what?”

It was the question every scholar dreads. In this case it came at the end of a PhD proposal presentation. The student had done a decent job outlining his planned project and the early questions from the panel had established his familiarity with the literature. Then one old professor asked the dreaded question.

“So what? Why do this study? What does it mean for the man on the street? You are asking for a three-year holiday from the real world to conduct an academic study. Why should the taxpayer fund this?”

The student was clearly unprepared for these sorts of questions. He referred to the gap in the literature and the need for more research, but the old professor wasn't satisfied. An awkward moment of silence followed. The student shuffled his notes to buy another moment of time. In desperation he speculated about some likely implications for practitioners and policy-makers. It was not a good answer but the old professor backed off. The point had been made. While the student had outlined his methodology and data analysis plan, he had given no thought to the practical significance of his study. The panel approved his proposal with one condition. If he wanted to pass his exam in three years' time he would need to come up with a good answer to the “so what?”

Type
Chapter
Information
The Essential Guide to Effect Sizes
Statistical Power, Meta-Analysis, and the Interpretation of Research Results
, pp. 3 - 30
Publisher: Cambridge University Press
Print publication year: 2010

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  • Introduction to effect sizes
  • Paul D. Ellis, Hong Kong Polytechnic University
  • Book: The Essential Guide to Effect Sizes
  • Online publication: 05 June 2012
  • Chapter DOI: https://doi.org/10.1017/CBO9780511761676.002
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  • Introduction to effect sizes
  • Paul D. Ellis, Hong Kong Polytechnic University
  • Book: The Essential Guide to Effect Sizes
  • Online publication: 05 June 2012
  • Chapter DOI: https://doi.org/10.1017/CBO9780511761676.002
Available formats
×

Save book to Google Drive

To save content items to your account, please confirm that you agree to abide by our usage policies. If this is the first time you use this feature, you will be asked to authorise Cambridge Core to connect with your account. Find out more about saving content to Google Drive.

  • Introduction to effect sizes
  • Paul D. Ellis, Hong Kong Polytechnic University
  • Book: The Essential Guide to Effect Sizes
  • Online publication: 05 June 2012
  • Chapter DOI: https://doi.org/10.1017/CBO9780511761676.002
Available formats
×