Two-Parameter Logistic Model

The Two-Parameter Logistic Model is a mathematical framework used in assessments, like tests or surveys, to understand how different individuals perform based on their ability and question difficulty. It considers two key factors: a person's ability (how skilled they are) and the difficulty of an item (how hard the question is). The model predicts the probability that a person will answer correctly, with higher ability increasing the chance, and more difficult questions decreasing it. This helps in creating fair, precise measurements of abilities or traits across diverse individuals.