This means that this approach can account for the level of challenge of the different questions and produce IRT scores that are comparable no matter which questions each learner answered.
Mae hyn yn golygu y gall y dull hwn gyfrif am lefel yr her ar gyfer y gwahanol gwestiynau a chynhyrchu sgoriau IRT y gellir eu cymharu waeth pa gwestiynau a atebwyd gan bob disgybl.