Recently, I was thinking about how to improve the accuracy of assessment tests for ESL learners and so I googled and found Computerized Adaptive Testing (CAT).
During the process, I accidentally discovered an interesting theory behind it. It’s called Items Response Theory or IRT for short.
So I’ve spent some time reading up about it and in the process, picked up a few very useful bits about statistical hypothesis testing, which I’m very glad to have learned.
Below, I share the most important ideas about IRT that I’ve learned.