ANNEX FIGURE 4–1 Simplified version of portions of the inference network through which the HYDRIVE student model is operationalized and updated. NOTE: Bars represent probabilities, summing to one for all the possible values of a variable. A shaded bar extending the full width of a node represents certainty, due to having observed the value of that variable; i.e., a student’s actual responses to tasks.

SOURCE: Mislevy (1996, p. 407). Used with permission of the author.



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