| balanced.pcdesign {eba} | R Documentation |
Balanced Paired-Comparison Design
Description
Creates a (completely) balanced paired-comparison design.
Usage
balanced.pcdesign(nstimuli)Arguments
nstimuli |
number of stimuli in the paired-comparison design |
Details
When nstimuli is odd, the presentation order is completely balanced,
that is any given stimulus appears an equal number of times as the first
and second member of a pair. When nstimuli is even, the presentation
order is balanced as much as possible. Subjects should be equally assigned
to listA and listB for the purpose of balancing the
within-pair presentation order across a sample of subjects. Pairs should be
re-randomized for each subject. See David (1988) for details.
Value
pairs |
a character array holding the balanced pairs |
listA |
the vector pairs in the original within-pair order |
listB |
the vector of pairs in the inverted within-pair order |
References
David, H. (1988). The method of paired comparisons. London: Griffin.
See Also
Examples
## Create balanced design for 6 stimuli
bp <- balanced.pcdesign(6)
## Replicate each within-pair order 10 times and re-randomize
cbind(replicate(10, sample(bp$listA)), replicate(10, sample(bp$listB)))