If a student has ability \(a\), and a probably is \(d\) difficulty, the probability of a student getting something right:

\begin{equation} \sigma (a-d) \end{equation}

this doesn’t consider **SLIPPING** at all.

If a student has ability \(a\), and a probably is \(d\) difficulty, the probability of a student getting something right:

\begin{equation} \sigma (a-d) \end{equation}

this doesn’t consider **SLIPPING** at all.