Asymptotic means that the curves approach, but never intercept their limits. Ogival ICCs can never dip below 0 probability, neither can they have little bumps nor sharp changes in direction. In Figure 2, the dotted ICC comes closest to a 2-PL ogive. Measurement-related problems in functional assessment. Comparison of relative precision using Likert and Rasch scoring methods.
Nothing is more applicable than good theory.
Distinctions between assumptions and requirements in measurement in the social sciences. A comparison of deterministic and probabilistic approaches to learning structures. Go to Institute for Objective Measurement Home Page.