read.resp {irtoys} | R Documentation |
Reads responses to a questionnaire from a text file
read.resp(file, na=".")
file |
File name |
na |
The symbol used to represent missing data |
Included for those of my students 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 irtoys
deals 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 irtoys
that accept other kinds
of data: sco
and tgp
.
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).
Ivailo Partchev
## Not run: r <- read.resp("c:/myfiles/irt.dat") ## End(Not run)