Description Usage Arguments Value Examples
Function works equivalent to contr.wec
from the wec
package, but allows
for weighted contrasts.
1 | contr.wec.weighted(x, omitted, weights)
|
x |
Grouping variable of class factor |
omitted |
Label of the factor label that should be taken as the omitted category |
weights |
Numeric vector of non-negative weights
from |
Returns a contrast matrix based on weighted effect coding.
1 2 3 4 5 6 7 8 | ### exemplary data according to wec paper
dat <- data.frame ( group = as.factor(c(rep(1,3), rep(2,2))), wgt = c(2/3, 4/3, 2, 3/8, 5/8))
### default contrasts
contrasts(dat[,"group"])
### weighted effect coding for weighted data
contr.wec.weighted(x= dat[,"group"], omitted=1,weights=dat[,"wgt"])
### equal to weighted effect coding: wec::contr.wec(x= dat[,"group"], omitted=1)
contr.wec.weighted(x= dat[,"group"], omitted=1,weights=rep(1, nrow(dat)))
|
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