Reads responses to a questionnaire from a text file
The symbol used to represent missing data
Included for those who are too faint-hearted to write
as.matrix(read.table(file, head=F)). Of course, data can be entered
into R in many other ways.
The data values in the
file must be separated with blanks.
Responses are the empirical data used in IRT. Note that
with models for dichotomous data, and typically expects data consisting of
zeroes and ones, without any missing values (non-responses are considered as
wrong responses). In fact, there are only two commands in
accept other kinds of data:
read.resp does accept missing data and values other than 0 and 1. Use
sco and a key to score multiple choice responses to 0/1. If you have
dichotomous data that contains NAs, you can use
sco without a key to
change all NA to 0.
A matrix, typically of zeroes and ones, representing the correct or wrong responses given by persons (rows) to items (columns).
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## Not run: r <- read.resp("c:/myfiles/irt.dat") ## End(Not run)