Tuesday, September 9, 2014

Moodle grade report


Facility index

Sometimes the "facility index" does not make sense.

This is the average score on the item, expressed as a percentage:
\displaystyle F_{p}=100{\frac {{\bar {x}}_{p}-x_{p}(min)}{x_{p}(max)-x_{p}(min)}}.
The higher the facility index, the easier the question is (for this cohort of students).


Discrimination index

This is the product moment correlation coefficient between x_{p} and X_{p}, expressed on a percentage scale. That is,
\displaystyle D_{p}=100r(x_{p},X_{p})=100{\frac {C(x_{p},X_{p})}{{\sqrt {V(x_{P})V(X_{p})}}}}.

https://docs.moodle.org/dev/Quiz_statistics_calculations
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