Response times are a dominant dependent variable in cognitive psychology (and other areas). It is common that raw response times need to undergo some trimming before being submitted to inferential analysis; this is because RTs typically suffer from outliers: a small proportions of RTs that lie at the extremes of the response time distribution and … Continue reading trimr: An R Package of Response Time Trimming Methods
Below I outline an argument for moving towards a clearer, more objective, way to trim response times. I first discuss the importance of response time trimming, and then outline various methods commonly used by researchers. I then quantify the diversity of these methods by reviewing 3 years of articles from two prominent cognitive psychology journals, and … Continue reading On the diversity of response time trimming methods
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?