stratifiedItersplits {rapidsplithalf} | R Documentation |
stratifiedItersplits
Description
Generate stratified splits for a single participant
Usage
stratifiedItersplits(splits, groupsizes)
Arguments
splits |
Number of iterations. |
groupsizes |
An integer vector of how many RTs per group need to be stratified. |
Details
This equally splits what can be equally split within groups. Then it randomly splits all the leftovers to ensure near-equal split sizes. This function is moreso used internally, but you can use it if you know what you are doing.
Value
A matrix with zeroes and ones. Each column is a random split.
Examples
# We will create splits stratified by stimulus for a single participant
data(foodAAT)
currdata<-foodAAT[foodAAT$subjectid==3,]
currdata$stratfactor<-interaction(currdata$is_pull,currdata$is_target,currdata$stimid)
currdata<-currdata[order(currdata$stratfactor),]
groupsizes<-rle(as.character(currdata$stratfactor))$lengths
mysplits<-stratifiedItersplits(splits=1000,groupsizes=groupsizes)
# Now the data can be split with the values from any column.
half1<-currdata[mysplits[,1]==1,]
half2<-currdata[mysplits[,1]==0,]
# Or the split objects can be used as masks for the aggregation functions in this package
meansByMask(x=currdata$RT,mask=mysplits==1)
[Package rapidsplithalf version 0.2 Index]