Downcoding an Item Response Dataset
Recodes item categories in a data frame such that each item has values 0,1,…,K_i.
tam_downcode(dat)
dat |
Data frame containing item responses |
List with following entries
dat |
Recoded dataset |
rec |
Recoding table |
############################################################################# # EXAMPLE 1: Downcoding in a toy example ############################################################################# #-- simulate some toy data set.seed(989) # values to be sampled vals <- c(NA, 0:6) # number of persons and items N <- 10; I <- 5 dat <- as.data.frame(matrix(NA, nrow=N, ncol=I)) colnames(dat) <- paste0("I",1:I) for (ii in 1L:I){ dat[,ii] <- sample(vals, size=N, replace=TRUE) } #-- apply downcoding res <- TAM::tam_downcode(dat) dat <- res$dat # extract downcoded dataset rec <- res$rec # extract recoded table
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