speed1 {hmmr}

Speed Accuracy Switching Data

Description

This data set is a bivariate series of response times and accuracy scores of a single participant switching between slow/accurate responding and fast guessing on a lexical decision task. The slow and accurate responding, and the fast guessing can be modelled using two states, with a switching regime between them. The dataset further contains a third variable called Pacc, representing the relative pay-off for accurate responding, which is on a scale of zero to one. The value of Pacc was varied during the experiment to induce the switching. This data set is a from participant A in experiment 1a from Dutilh et al (2011). The data here is the first series of 168 trials. The speed data set in the depmixS4 package has two more series of 134 and 137 trials respectively.

Usage

data(speed1)

Format

A data frame with 168 observations on the following 3 variables.

RT

a numeric vector of response times (log ms)

ACC

a numeric vector of accuracy scores (0/1)

Pacc

a numeric vector of the pay-off for accuracy

Source

Gilles Dutilh, Eric-Jan Wagenmakers, Ingmar Visser, & Han L. J. van der Maas (2011). A phase transition model for the speed-accuracy trade-off in response time experiments. Cognitive Science, 35:211-250.

Examples

data(speed1)