Abstract
This note uses the EM-algorithm in an item response model as an illustration of a general method of parameter estimation, which geometrically can be described as an alternating projection method.
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The research was initiated by a series of lectures on alternating projection methods given by Imre Csiszar in 1993 at Stanford University where the first author was a graduate student.
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Ip, E.H., Lalwania, N. A note on the geometric interpretation of the EM algorithm in estimating item characteristics and student abilities. Psychometrika 65, 533–537 (2000). https://doi.org/10.1007/BF02296343
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DOI: https://doi.org/10.1007/BF02296343