CTT {exametrika}R Documentation

Classical Test Theory

Description

This function calculates the overall alpha and omega coefficients for the given data matrix. It also computes the alpha coefficient for each item, assuming that item is excluded.

Usage

CTT(U, na = NULL, Z = NULL, w = NULL)

Arguments

U

U is a data matrix of the type matrix or data.frame.

na

na argument specifies the numbers or characters to be treated as missing values.

Z

Z is a missing indicator matrix of the type matrix or data.frame

w

w is item weight vector

Value

Returns a list of class c("exametrika", "CTT") containing two data frames:

Examples


# using sample dataset
CTT(J15S500)


[Package exametrika version 1.1.0 Index]