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ability estimation accuracy and response accuracy and speed analyses analysis of covariance asymptotic accuracy characterizing test cognitive psychology computerized testing correctly to items depicted in Figure explained uniquely grand mean item differences item difficulty item easiness zy Item Response Theory item slowness Law School Admission little variability log response lognormally distributed low-scoring test takers lower asymptote maximum likelihood minimal processing processing speed psychometric Psychometricians quantitative test reasoning test reflect rapid guessing regression relative item easiness respond correctly response accuracy response speed response-accuracy submodel response-speed submodel response-time data response-time distributions Schnipke and Scrams solution strategies speed and accuracy speed-accuracy relationship speed-accuracy tradeoff functions standard testing strategy selection taker and item test speededness test taker ability test taker differences test taker slowness testing context Thissen's total variability uniquely by item uniquely by relative uniquely by test unobtrusively during operational unrelated upper asymptote variability in log verbal and quantitative verbal test