balanced.pcdesign {eba} | R Documentation |
Creates a (completely) balanced paired-comparison design.
balanced.pcdesign(nstimuli)
nstimuli |
number of stimuli in the paired-comparison design |
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.
In order to balance the within-pair presentation order over a sample of
subjects, subjects should be equally assigned to listA
and
listB
.
Pairs should be re-randomized for each subject.
pairs |
a character array holding the balanced pairs; see David (1988) for details how it is constructed |
listA |
the vector pairs in the original within-pair order |
listB |
the vector of pairs in the inverted within-pair order |
David, H. (1988). The method of paired comparisons. London: Griffin.
## Create balanced design for 6 stimuli bp <- balanced.pcdesign(6) ## Replicate each with-pair order 10 times and re-randomize cbind(replicate(10, sample(bp$listA)), replicate(10, sample(bp$listB)))