Global Utilities

Statistics Reform

There is a brief discussion in our paper of the need for reform of how psychologists and some other researchers analyse data and present findings. Since writing the paper the new edition of the APA manual has appeared:

American Psychological Association. (2001). Publication manual of the American Psychological Association (5th ed.). Washington, DC: Author. http://www.apa.org/books/4200060.html

The following quotes from the Manual indicate that effect size measures and confidence intervals are likely to be required routinely by journal editors, and will be seen often by anyone reading published research. These are highly desirable developments.

For the reader to fully understand the importance of your findings, it is almost always necessary to include some index of effect size or strength of relationship in your Results section. You can estimate the magnitude of effect or the strength of the relationship with a number of common effect size estimates... The general principle to be followed... is to provide the reader not only with information about statistical significance but also with enough information to assess the magnitude of the observed effect or relationship. (pp. 25-26, emphasis added)

The reporting of confidence intervals... can be an extremely effective way of reporting results. Because confidence intervals combine information on location and precision and can often be directly used to infer significance levels, they are, in general, the best reporting strategy. The use of confidence intervals is therefore strongly recommended. (p. 22, emphasis added)

The aim of ESCI is to provide tools that may assist researchers, teachers and students to explore the relevant concepts and to analyse and present their data in accordance with these new requirements.


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