Multiple-Category Classification Using a Sequential Probability Ratio Test.

Sequential probability ratio testing (SPRT), which usually is applied in situations requiring a decision between two simple hypotheses or a single decision point, is extended to include situations involving k decision points and [(£ + l)-choose-2 ] sets of simultaneous, simple hypotheses, where k> \ . The multiple-decision point or multiple-category SPRT procedure can be used to classify examinees into k + 1 categories using computer adaptive methods. Computer simulations utilizing a 2 0 0 -item pool of previously calibrated test items show that the multiplecategory SPRT method controls misclassification error rates adequately, provided that the number of decision points is not too large.