The use of a three-parameter logistic model for applying latent trait theory has become more popular because of the availability of computer programs. The program Logist 5 can be used not only for the item parameter estimation in the three-parameter logistic model, but also in the two parameter logistic model by setting the third parameter equal…

In August 1972, Kirkwood Community College began a research project to: (1) ascertain population and enrollment trends by various age groups for each of Iowa's 15 school areas and for the State as a whole; (2) ascertain potential enrollment by categories of students; (3) develop awareness of the relation of population and enrollment changes to…