Item Analysis Analytics Part 6: Determining Whether a Question Makes the Grade

Posted by Greg Pope

In my previous blog post I talked about outcome discrimination and outcome correlation and their relationship to one another. Now I will provide some criteria that can be used for outcome discrimination and outcome correlation coefficients to judge whether a question is making the grade in terms of psychometric quality.

Outcome discrimination (high-low)

Outcome correlation (Point-biserial correlation)

I’ll be back with more juicy psychometrics soon!

Related posts:

1. Item Analysis Analytics Part 5: Outcome Discrimination and Outcome Correlation
2. Item Analysis Analytics Part 4: The Nitty-Gritty of Item Analysis
3. Item Analysis Analytics Part 3: What to Look for in an Item Analysis Report
4. Item Analysis Analytics Part 8: Some problematic questions
5. Item Analysis Analytics Part 7: The psychometric good, bad and ugly