TY - JOUR T1 - On the effect of adding clinical samples to validation studies of patient-reported outcome item banks: a simulation study JF - Quality of Life Research Y1 - 2016 A1 - Smits, Niels AB - To increase the precision of estimated item parameters of item response theory models for patient-reported outcomes, general population samples are often enriched with samples of clinical respondents. Calibration studies provide little information on how this sampling scheme is incorporated into model estimation. In a small simulation study the impact of ignoring the oversampling of clinical respondents on item and person parameters is illustrated. VL - 25 UR - https://doi.org/10.1007/s11136-015-1199-9 ER -