dmcFitSubject | R Documentation |
Fit theoretical data generated from dmcSim to observed data by minimizing the root-mean-square error ("RMSE") between a weighted combination of the CAF and CDF functions using optim (Nelder-Mead). Alternative cost functions include squared percentage error ("SPE"), and g-squared statistic ("GS").
dmcFitSubject(
resOb,
nTrl = 1e+05,
startVals = list(),
minVals = list(),
maxVals = list(),
fixedFit = list(),
fitInitialGrid = TRUE,
fitInitialGridN = 10,
fixedGrid = list(),
freeCombined = list(),
nCAF = 5,
nDelta = 19,
pDelta = vector(),
tDelta = 1,
deltaErrors = FALSE,
spDist = 1,
drOnset = 0,
drDist = 0,
drShape = 3,
drLim = c(0.1, 0.7),
rtMax = 5000,
costFunction = "RMSE",
subjects = c(),
printInputArgs = TRUE,
printResults = FALSE,
optimControl = list(),
numCores = 2
)
resOb |
Observed data (see flankerData and simonTask for data format) and the function dmcObservedData to create the required input from either an R data frame or external *.txt/*.csv files |
nTrl |
Number of trials to use within dmcSim. |
startVals |
Starting values for the to-be estimated parameters. This is a list with values specified individually for amp, tau, drc, bnds, resMean, resSD, aaShape, spShape, spBias, sigm (e.g., startVals = list(amp = 20, tau = 200, drc = 0.5, bnds = 75, resMean = 300, resSD = 30, aaShape = 2, spShape = 3, spBias = 0, sigm = 4, bndsRate=0, bndsSaturation=0)). |
minVals |
Minimum values for the to-be estimated parameters. This is a list with values specified individually for amp, tau, drc, bnds, resMean, resSD, aaShape, spShape, spBias, sigm (e.g., minVals = list(amp = 0, tau = 5, drc = 0.1, bnds = 20, bndsRate=0, bndsSaturation=0, resMean = 200, resSD = 5, aaShape = 1, spShape = 2, spBias = -20, sigm = 1)). |
maxVals |
Maximum values for the to-be estimated parameters. This is a list with values specified individually for amp, tau, drc, bnds, resMean, resSD, aaShape, spShape, spBias, sigm (e.g., maxVals = list(amp = 40, tau = 300, drc = 1.0, bnds = 150, bndsRate=1, bndsSaturation=500, resMean = 800, resSD = 100, aaShape = 3, spShape = 4, spBias = 20, sigm = 10)) |
fixedFit |
Fix parameter to starting value. This is a list with bool values specified individually for amp, tau, drc, bnds, resMean, resSD, aaShape, spShape, spBias, sigm (e.g., fixedFit = list(amp = F, tau = F, drc = F, bnds = F, bndsRate=T, bndsSaturation=T, resMean = F, resSD = F, aaShape = F, spShape = F, spBias = T, sigm = T)) NB. Value if fixed at startVals. |
fitInitialGrid |
TRUE/FALSE |
fitInitialGridN |
10 linear steps between parameters min/max values (reduce if searching more than ~2/3 initial parameters) |
fixedGrid |
Fix parameter for initial grid search. This is a list with bool values specified individually for amp, tau, drc, bnds, resMean, resSD, aaShape, spShape, spBias, sigm (e.g., fixedGrid = list(amp = T, tau = F, drc = T, bnds = T, bndsRate=T, bndsSaturation=T, resMean = T, resSD = T, aaShape = T, spShape = T, spBias = T, sigm = T)). As a default, the initial gridsearch only searches the tau space. |
freeCombined |
If fitting 2+ datasets at once, which parameters are allowed to vary between both fits (default = all parameters fixed between the two fits e.g. parameter = F). This is a list with bool values specified individually for amp, tau, drc, bnds, resMean, resSD, aaShape, spShape, spBias, sigm (e.g., freeCombined = list(amp = F, tau = F, drc = F, bnds = F, bndsRate=F, bndsSaturation=F, resMean = F, resSD = F, aaShape = F, spShape = F, spBias = F, sigm = F)) |
nCAF |
Number of CAF bins. |
nDelta |
Number of delta bins. |
pDelta |
An alternative option to nDelta (tDelta = 1 only) by directly specifying required percentile values (vector of values 0-100) |
tDelta |
The type of delta calculation (1=direct percentiles points, 2=percentile bounds (tile) averaging) |
deltaErrors |
TRUE/FALSE Calculate delta bins for error trials |
spDist |
The starting point (sp) distribution (0 = constant, 1 = beta, 2 = uniform) |
drOnset |
The starting point of controlled drift rate (i.e., "target" information) relative to automatic ("distractor" incormation) (> 0 ms) |
drDist |
The drift rate (dr) distribution type (0 = constant, 1 = beta, 2 = uniform) |
drShape |
The drift rate (dr) shape parameter |
drLim |
The drift rate (dr) range |
rtMax |
The limit on simulated RT (decision + non-decisional components) |
costFunction |
The cost function to minimise: root mean square error ("RMSE": default), squared percentage error ("SPE"), or likelihood-ratio chi-square statistic ("GS") |
subjects |
NULL (aggregated data across all subjects) or integer for subject number |
printInputArgs |
TRUE (default) /FALSE |
printResults |
TRUE/FALSE (default) |
optimControl |
Additional control parameters passed to optim (see optim details section) |
numCores |
Number of cores to use |
dmcFitSubject returns a list of objects of class "dmcfit"
# Code below can exceed CRAN check time limit, hence donttest
# Example 1: Flanker data from Ulrich et al. (2015)
fit <- dmcFitSubject(flankerData, nTrl = 1000, subjects = c(1, 2));
plot(fit, flankerData, subject = 1)
plot(fit, flankerData, subject = 2)
summary(fit)
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