Monthly Archives: January 2013

Computing Omega Grant B. Morgan We have talked a bit about the differences between three models based on Classical Test Theory (i.e., parallel, tau equivalent, and congeneric tests). You can take the output from a chosen model to estimate the … Continue reading →

Here is a sample of code to read in the data for assignment #2. I posted the datafile on Blackboard so you can downloaded it. You’ll just need to update the code to reflect the location of the file on … Continue reading →

Classical Test Theory Reliability Functions The data used to demonstrate these functions is read in first. data_demo <- read.table(“C:\\Users\\grant_morgan\\Desktop\\Teaching\\EDP 6337 – Psychometric Theory\\Spring 2014\\Data\\data_demo.DAT”, sep = “,”, header = FALSE) The code below contains 3 functions that can aid in … Continue reading →