P Values vs Magnitude-based Inference
Will G Hopkins, Institute of Sport Exercise and Active Living, Victoria University, Melbourne, Australia. Email. Reviewer: Alan M Batterham, School of Health and Social Care, University of Teesside, Middlesbrough, UK. Sportscience 21, i, 2017 (sportsci.org/2017/inbrief.htm#pVsMBI). Published May 2017. ©2017
A slideshow explaining p values, magnitude-based inference (MBI), and the American Statistical Association's policy statement on p values is now available. The slideshow has the title of the In-brief item in last year's Sportscience, P Values Down But Not Yet Out, and it represents an elaboration of that item. The slideshow was presented at the 8th International Conference on Kinesiology in Opatija, Croatia, May 10-14, 2017 and at various workshops subsequently.
Other resources on statistical inference
A one-hour lecture on data analysis and interpretation has an earlier summary of null-hypothesis testing and MBI.
The article describing the spreadsheet to derive MBI from a p value has a detailed explanation of clinical and non-clinical MBI. To derive MBI from a confidence interval use the spreadsheet to combine/compare effects (and read the accompanying article).
The first peer-reviewed article on MBI published here and in International Journal of Sports Physiology and Performance deals only with non-clinical inference.
The article on progressive statistics published here and in Medicine and Science in Sports and Exercise has a summary of MBI and much, much more.
Will G Hopkins, Institute of Sport Exercise and Active Living, Victoria University, Melbourne, Australia. Email. Sportscience 21, i, 2017 (sportsci.org/2017/inbrief.htm#impactfactors. Published September 2017. ©2017
Download the workbook (28 KB) of impact factors.
As noted in a 2015 article, I have abandoned Thomson-Reuters' impact factors in favor of Elsevier's, which are derived from a bibliographic database (Scopus) more relevant to sport and exercise science, and which are freely available in a very large workbook (33 MB) at Journal Metrics. Elsevier refers to the impact factor as the CiteScore, but it is calculated in the same manner as the traditional impact factor. I have extracted the values for our journals into a user-friendly small workbook (28 KB), which has spreadsheets sorted by journal title and by 2016 impact factor. As of last year I will not be writing a full article on the impact factors.