grt (version 0.2.1)

grg: General Random Guessing model

Description

General Random Guessing model

Usage

grg(response, fixed = FALSE, k = 2)

Arguments

response

A vector containing participant's classification responses.

fixed

logical. If TRUE, Fixed Random Guessing model is fitted. If FALSE, General Random Guessing model is fitted. see ‘Details’

k

numeric. the penalty per parameter to be used in calculating AIC. Default to 2.

Value

object of class grg, which is a list object containing:

par

the fixed or estimated response bias

logLik

the log-likelihood of the model

AIC

Akaike's An Information Criterion for the fitted model

Details

The function assumes that there are two categories (e.g, ‘A’ and ‘B’) to which each stimulus belongs.

Fixed Random Guessing model assumes that participant responded randomly without response bias; for each stimulus, probability of responding ‘A’ and ‘B’ is .5. There are no free parameters in this model (i.e., df = 0).

General Random Guessing model assumes that participants responded randomly but is biased toward one response. The model estimates the response bias (df = 1).

References

Ashby, F. G., & Crossley, M. J. (2010). Interactions between declarative and procedural-learning categorization systems. Neurobiology of Learning and Memory, 94, 1-12.

See Also

glc, gqc, extractAIC.grg

Examples

# NOT RUN {
data(subjdemo_2d)
fit.grand <- grg(subjdemo_2d$response, fixed=FALSE)

fit.frand <- grg(subjdemo_2d$response, fixed=TRUE)
# }