View source: R/immer_unique_patterns.R
immer_unique_patterns | R Documentation |
Extracts unique item response patterns.
immer_unique_patterns(dat, w=rep(1, nrow(dat)))
dat |
Data frame containing integer item responses |
w |
Optional vector of weights |
A list with entries
y |
Data frame with unique item response patterns |
w |
Vector of frequency weights |
y_string |
Item response pattern coded as a string |
See mirt::expand.table
for back-converting
unique item response patterns into a data frame with item responses.
############################################################################# # EXAMPLE 1: Unique item response patterns data.read ############################################################################# data( data.read, package="sirt") dat <- data.read # extract item response patterns res <- immer::immer_unique_patterns(dat) ## Not run: # back-conversion with expand.table dat2 <- mirt::expand.table( cbind( res$y, res$w ) ) # check correctness colMeans(dat) colMeans(dat2) ## End(Not run)
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