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Peer reviewedHu, Xiangen; Batchelder, William H. – Psychometrika, 1994
The statistical analysis of processing tree models is advanced by showing how the parameters of estimation and hypothesis testing, based on the likelihood functions, can be accomplished by adapting the expectation-maximization (EM) algorithm. The adaptation makes it easy to program a personal computer to accomplish the stages of statistical…
Descriptors: Computer Software, Equations (Mathematics), Estimation (Mathematics), Hypothesis Testing
Peer reviewedOttenbacher, Kenneth J. – Journal of Special Education, 1990
The agreement between visual analysis and the results of the split-middle method of trend estimation was examined using a set of 24 stimulus graphs and 30 raters. Results revealed poor agreement between the two methods, and low sensitivity, specificity, and predictive ability for visual analysis in relation to statistical inferences. (JDD)
Descriptors: Elementary Secondary Education, Estimation (Mathematics), Evaluation Methods, Graphs
