# Low Power & Effect Sizes

Yesterday I posted the following tweet which has since turned out to be my most popular tweet EVER with hundreds of retweets and "likes" in 24 hours: https://twitter.com/JimGrange/status/838436187144605696 My motivation for the tweet was quite straightforward. I have recently been emailing academics in my department every week with different topics in an attempt to raise … Continue reading Low Power & Effect Sizes

# Statistics Tables: Where do the Numbers Come From?

This is a blog for undergraduates grappling with stats! Last week I was having a chat with an undegraduate student who was due to analyse some data. She was double-checking how to determine the statistical significance of her analysis. I mentioned that she could either use SPSS (which would provide the value directly), or obtain … Continue reading Statistics Tables: Where do the Numbers Come From?

# flankr: Modelling Eriksen Flanker Task Performance

Do you do research using the Eriksen flanker task? Want to engage in some computational modelling of your data? I've recently had a paper published in Behavior Research Methods reporting an R package that allows users to fit two recent computational models of performance in the Eriksen flanker task: the Dual-Stage Two-Phase (DSTP) model of … Continue reading flankr: Modelling Eriksen Flanker Task Performance

# Fooled by Probability

Teaching statistics to psychology undergraduate is one of the most demanding (yet rewarding) aspects of my job. This job is likely made harder by the fact that humans have a very poor "intuitive" grasp of probability. In preparation for a class this coming semester, I revisited one of my favourite examples of just how bad … Continue reading Fooled by Probability

# (Don’t) Lose Your Inhibitions

[Cognitive inhibition can be defined as]...the stopping or overriding of a mental process, in whole or in part, with or without intention —MacLeod (2007) The concept of cognitive inhibition is rather controversial in cognitive science. When performing a task or an action in the face of competing tasks/actions, is it sufficient to activate a representation … Continue reading (Don’t) Lose Your Inhibitions

# Response Time Modelling – How Many Trials?

Over the past year I have become increasingly interested in using models of simple decision making processes, as measured by two-choice response time tasks. A simple 2-choice task might ask participants to judge whether a presented number is odd or even, for example. One popular model of 2-choice RT is the Ratcliff Diffusion Model. A … Continue reading Response Time Modelling – How Many Trials?