Step 1. Initiation
In Step 1, an initial estimate is made of the proficiency level of the
candidate. Generally, the ability level is initialized at the mean of the
proficiency distribution of the population (THISSEN; MISLEVY, 2000). An
alternative is to randomly draw it from the ability distribution. Besides,
initialization based on previously known information about the candidate
might be applied as well (VAN DER LINDEN, 1999).