#'@importFrom stats contrasts<-
changeContrast <- function(data,contr){
isfact <- sapply(data, function(c){is.factor(c)||is.character(c)})
for(i in c( 1:ncol(data))[isfact]){
data[ ,i] <- as.factor(data[ ,i])
data[ ,i] <- droplevels(data[ ,i])
contrasts(data[ ,i]) <- contr
}
return(data)
}
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