require(multilevelPSA)
if(require(pisa, quietly=TRUE)) {
data(pisa.student)
data(pisa.psa.cols)
pisa.student = pisa.student[,c('CNT', pisa.psa.cols)]
pisa.student$CNT = as.character(pisa.student$CNT)
missing.plot(pisa.student, pisa.student$CNT)
} else {
message("pisa package not installed. Try\nrequire(devtools)\ninstall_github('jbryer/pisa')")
}
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