This function prepares data into a required list format

This function generates a list of data sets using the scored original data set, which can be used as objects in subscore computing functions.

Usage

data.prep(scored.data, subtest.infor, subtest.names = NULL)

Arguments

scored.data

Original scored data set with rows as individuals and columns as items.

subtest.infor

A numerical vector. The first number indicates the number of subtests, followed by numbers of items on each subscale.

subtest.names

Names of the subscales AND the entire test. The default is NULL. If not provided, names of "subtest.1", "subtest.2",..., will be assigned.

Value

A list that contains item responses of all subtests and the entire test. The list is then used by other functions (e.g., CTTsub) in the package to obtain subscores.

Examples

        subtest.infor<-c(3,15,15,20) 
        subtest.names<-c("Algebra","Geometry","Measurement", "Math")
        # This math test consists of 3 subtests, which have 15 algebra 
        # items, 15 geometry items, and 20 measurement items.
        test.data<-data.prep(scored.data, subtest.infor, subtest.names)