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In addition, the delta technique standard errors are somewhat enhanced if the harmonic suggest can be used for unequal numbers of raters per subject as opposed to the arithmetic mean. © The Author(s) 2019.When computerized adaptive testing (pet) is under strict item visibility control, the accuracy of characteristic estimation will significantly reduce. A new item choice method, the powerful Stratification technique predicated on Dominance Curves (SDC), that is aimed at improving characteristic estimation,