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Journal of Educational…1
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Hunt, Earl1
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The Design of Ballantines.
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Hunt, Earl – 1985
The widespread availability of computational graphics for personal computers has greatly increased the potential for visual display of research data. The correlation between two variables can be represented graphically by using circles to represent the variance associated with each circle, and by letting the overlap between the circles be…
Descriptors: Algorithms, Analysis of Covariance, Computer Graphics, Correlation
Item Parameter Estimation via Marginal Maximum Likelihood and an EM Algorithm: A Didactic.
Peer reviewed Peer reviewed
Harwell, Michael R.; And Others – Journal of Educational Statistics, 1988
The Bock and Aitkin Marginal Maximum Likelihood/EM (MML/EM) approach to item parameter estimation is an alternative to the classical joint maximum likelihood procedure of item response theory. This paper provides the essential mathematical details of a MML/EM solution and shows its use in obtaining consistent item parameter estimates. (TJH)
Descriptors: Algorithms, Computer Software, Equations (Mathematics), Estimation (Mathematics)