There has been quite a bit of buzz recently about the Button et al. Nature Reviews Neuroscience paper on statistical power. Several similar reviews have been published in psychology and other disciplines and come to broadly the same conclusion - that m...
I wasn't going to post on this ... but couldn't resist. A recent QJEP paper reports suspicious patterns in p values across three psychology journals. This has been blogged elsewhere (see here and here), so I haven't got too much to add. Although ...
I wasn't going to post on this ... but couldn't resist. A recent QJEP paper reports suspicious patterns in p values across three psychology journals.This has been blogged elsewhere (see here and here), so I haven't got too much to add. Although I ...
... or to be more precise, what's up with experimental social psychology?A number of high profile cases of suspected (in some cases admitted) fraud have been highlighted in psychology recently - my own discipline - but they've (nearly all arisen in exp...
R² is such a lovely statistic, isn't it? Unlike so many of the others, it makes sense--the percentage of variance in Y accounted for by a model. I mean, you can actually understand that. So can your grandmother. And the clinical audience you're writing the report for. A big R² is always big (and good!) and a small one is always small (and bad!), right? Well, maybe.
The companion web site for Serious Stats is now live:http://www.palgrave.com/psychology/baguley/The web site includes:- a free sample chapter (Chapter 15: Contrasts)- data sets- R scripts- 5 online supplements (for meta-analysis, multiple imputation, r...
Here is a list of the contents by chapter with quick notes on chapter content … 0. Preface (About the book; notes on software, mathematics and types of boxed sections) 1. Data, Samples and Statistics (A gentle review of measures … Continue reading →
A while ago I promised a longer post on standardized effect size. This isn't it. Instead it is a link to my piece in the February 2010 issue of The Psychologist. I had intended to write a short summary of my 2009 BJP paper, but that didn't r...
Every time I teach an introductory statistics course I'm struck by how difficult it is to run a simple 2 by 2 chi-square test of independence. SPSS is one of the worst culprits (but even in R it almost seems more trouble than it is worth to use a compu...
This is another quick blog entry related to a query I had today. In my moderated multiple regression workshop a while back I wrote (on slide 15) "don't use standardized regression coefficients". In the talk itself I briefly mentioned why and direct...
