Analysing a test with packages (psych, ltm, mirt) in R

This is an updated tutorial that gives guidance on how to conduct test analysis within the R environment. It demonstrates the following protocols.

1. Classical test theory difficulty, discrimination, and total score evaluation.

2. 1PL or Rasch analysis

3. 2PL analysis

4. 3PL analysis

The tutorial uses the following packages: psych, ltm, mirt