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!