Abstract
Neil W. Henry of the Gary Income Maintenance Experiment and Virginia Commonwealth University has developed a computer algorithm for maximum likelihood estimation of the parameters of latent class models. Henry wrote this program in ALFIE, a Purdue University superset of BASIC, in August, 1974. Since then, the program has been rewritten in transportable BASIC (by Philip Sidel at the University of Pittsburgh) and in FORTRAN IV (by Scott Cox of the Gary Income Maintenance Experiment). The BASIC version runs in interactive mode on unconstrained models. The FORTRAN IV version runs in batch mode, and three types of contraints may be specified.
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