Articles by Thom Baguley

Cronbach to the future

August 6, 2013 | 0 Comments

One fascinating thing about working in the area of psychological statistics is how hard it is to move people away from reliance on bad, inefficient or otherwise problematic methods. My own view - informed to some extent by the literature, by experience and by anecdote is that it isn't sufficient ... [Read more...]

Guest post: Visualizing data using a 3D printer

September 25, 2012 | 0 Comments

In a break from my usual obsessions and interests here is a guest blog post by Ian Walker. I'm posting it because I think it is rather cool and hope it will be of interest to some of my regular readers. Ian is perhaps best known (in the blogosphere) f... [Read more...]

The stimuli-as-fixed-effect fallacy

June 21, 2012 | 0 Comments

Neuroskeptic has just blogged on a new paper by Judd, Westfall and Kenny on Treating stimuli as a random factor in social psychology: A new and comprehensive solution to a pervasive but largely ignored problem. I can't access the original pap... [Read more...]

The aesthetics of error bars

May 27, 2012 | 0 Comments

This blog and my other main blog (the companion blog for my book) are now syndicated via R-bloggers (posts tagged R only) and The latter is a relatively new blog aggregator but looks to have some interesting content. R-bloggers it quite... [Read more...]

Serious stats – free statistics resources

March 23, 2012 | 0 Comments

The companion web site for Serious Stats is now live: web site includes:- a free sample chapter (Chapter 15: Contrasts)- data sets- R scripts- 5 online supplements (for meta-analysis, multiple imputation, r... [Read more...]

p curves revisited

March 15, 2012 | 0 Comments

I finally found some time to take a closer look at p curves. I haven't had a chance to follow-up my simulations (and probably won't for a few weeks if not months), but I have had time to think through the ideas the p curve approach raises based on some ... [Read more...]

R code for p curves

March 14, 2012 | 0 Comments

I have finally got around to posting the R code for my p curve simulation. Those familiar with R will realize how crude it is (I've been caught up with other urgent stuff and had no time to explore further).You are welcome to play with (and improve!) t... [Read more...]

Simulating p curves and detecting dodgy stats

February 16, 2012 | 0 Comments

Psych your mind has an interesting blog post on using p curves to detect dodgy stats in a a volume of published work (e.g., for a researcher or journal). The idea apparently comes from Uri Simonsohn (one of the authors of a recent paper on dodgy s... [Read more...]

Comparing correlations update

February 5, 2012 | 0 Comments

I have just published R code for calculating CIs for differences between correlations on the Serious stats book blog. This covers independent correlations (taken from chapter 6 of the book) and dependent correlations (new R code written as a suppl... [Read more...]

Serious Stats book and blog update

February 2, 2012 | 0 Comments

This is a quick update to announce my new blog Serious Stats. This is a companion to my forthcoming book of the same name:Baguley, T. (2012, in press). Serious stats: A guide to advanced statistics for the behavioral sciences. Basingstoke: Palgrav... [Read more...]

Calculating and graphing within-subject confidence intervals for ANOVA

October 4, 2011 | 0 Comments

Psychologists are gradually coming round to the view that it is a good idea to present interval estimates alongside point estimates of statistics. The most common statistic reported in psychology research is almost certainly the mean (strictly the arithmetic mean). Presenting an interval estimate for the mean of a single ... [Read more...]

R: An introduction for psychologists

January 13, 2011 | 0 Comments

Here are the slides from the Introduction to R session Danny Kaye and I ran at the BPS Mathematics, Statistics & Computing section CPS Workshop (13 December 2010, Nottingham Trent University). [Read more...]

Introduction to using R in research

May 13, 2010 | 0 Comments

I was recently asked to give a talk to our graduate school annual conference. I offered several titles and the one they picked was Using R in research. I'm not sure if this was a good idea or not. The graduate school covers PhD students across three ar... [Read more...]

Example of plotting a serial position curve in R

March 3, 2010 | 0 Comments

A while ago I wrote a co-wrote chapter for an introductory psychology text book Essential Psychology: A Concise Introduction. This is a book edited and written by members of the department where I work. My contribution was the chapter on huma... [Read more...]

Interaction plot from cell means

February 24, 2010 | 0 Comments

I needed to produce a few a interaction plots for my book in R and, while the interaction.plot() function is useful it has a couple of drawbacks. First, the default output isn't very pretty. Second, it works from the raw data, whereas I often need plot... [Read more...]
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