contr.wec.weighted {eatTools} | R Documentation |
Calculates contrasts for a weighted factor variable based on weighted effect coding
Description
Function works equivalent to contr.wec
from the wec
package, but allows
for weighted contrasts.
Usage
contr.wec.weighted (x, omitted, weights)
Arguments
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 |
Value
Returns a contrast matrix based on weighted effect coding.
Author(s)
Sebastian Weirich, based upon the contr.wec
function of the wec
package
Examples
### 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)))
[Package eatTools version 0.7.6 Index]