I blog about statistics and research design with an audience consisting of researchers in bilingualism, multilingualism, and applied linguistics in mind.
Latest blog posts
21 November 2016
In this post, I want to, first, help you to improve your intuition of what data patterns correlation coefficients can represent and, second, hammer home the point that to sensibly interpret a correlation coefficient, you need the corresponding scatterplot.
31 October 2016
This blog post is an edited version of a mail I sent round to my colleagues at the various language and linguistics departments in Fribourg. Nothing in this post is new per se, but I haven’t seen much discussion of these issues among linguists, applied linguists and bilingualism researchers.
I’d like to point you to an initiative of the Center for Open Science: the $1,000,000 Preregistration Challenge. The basic idea is to foster research transparency by offering a monetary reward to researchers who’ve outlined their study design and planned analyses in advance and report the results of these analyses in the report.
I’m not affiliated with this organisation, but I do think both it and its initiative are important developments. For those interested in knowing why I think so, I’ve written a brief text below that includes links to more detailed articles or examples; if you prefer reference lists, there’s one of those down below. Most of articles were written by and for psychologists, but I reckon pretty much all of it applies equally to research in linguistics and language learning.
18 August 2016
R sorts the levels of a factor alphabetically.
When drawing graphs, this results in ‘Alabama First’ graphs,
and it’s usually better to sort the elements of a graph by more meaningful principles than alphabetical order.
This post illustrates three convenience functions you can use to sort factor levels in
according to another covariate, their frequency of occurrence, or manually.
5 July 2016
I’d promised to write another installment on drawing graphs, but instead I’m going to write about something that I had to exclude, for reasons of space, from a recently published book chapter on age effects in second language (L2) acquisition: classifying observations (e.g., L2 learners) and estimating error rates.
I’m going to illustrate the usefulness of classification algorithms for addressing some problems in L2 acquisition research, but my broader aim is to show that there’s more to statistics than running significance tests and to encourage you to explore—even if superficially—what else is out there.
13 June 2016
Graphs are incredibly useful both for understanding your own data and for communicating your insights to your audience. This is why the next few blog posts will consist of tutorials on how to draw four kinds of graphs that I find most useful: scatterplots, line charts, boxplots and some variations, and Cleveland dotplots. These tutorials are aimed primarily at the students in our MA programme. Today’s graph: the line chart.
2 June 2016
Graphs are incredibly useful both for understanding your own data and for communicating your insights to your audience. This is why the next few blog posts will consist of tutorials on how to draw four kinds of graphs that I find most useful: scatterplots, linecharts, boxplots and some variations, and Cleveland dotplots. These tutorials are aimed primarily at the students in our MA programme. Today’s graph: the scatterplot.
18 May 2016
At a workshop last week, we were asked to bring along examples of good and bad academic writing. Several of the bad examples were papers where the number of significance tests was so large that the workshop participants felt that they couldn’t make sense of the Results section. It’s not that they didn’t understand each test separately but rather that they couldn’t see the forest for the trees. I, too, wish researchers would stop inundating their readers with t, F and p-values (especially in the running text), but until such time readers need to learn how to survive the ANOVA onslaught. Below I present a list of guidelines to help them with that.