This blog and my other main blog (the companion blog for my book) are now syndicated via R-bloggers (posts tagged R only) and statsblogs.com. The latter is a relatively new blog aggregator but looks to have some interesting content. R-bloggers it quite...
Interaction is different. Whether two variables are associated says nothing about whether they interact in their effect on a third variable. Likewise, if two variables interact, they may or may not be associated.
A longer version of my earlier post A problem of significance just appeared in The Psychologist. Baguley, T. (2012). Can we be confident in our statistics? The Psychologist. 25, 128-9. Shortly after publication I received an email asking about stat...
Several people have drawn my attention to a recent article on a common error in published statistical analyses in neuroscience. Sander Nieuwenhuis, Birte Forstmann and Eric-Jan Wagenmakers published (in Nature Neuroscience) a critique of statistical an...
I received a great question this week, as a submission to my Ask the Stats Make Me Cry Guy page, which asked: In order for a moderating relationship to exist, do the predictor IV and dependent variable need to be significantly correlated?". This is a question that I am asked a lot, partly because of the common confusion between mediators and moderators and the commonly held belief that an IV…
