@article {2618,
	title = {On the effect of adding clinical samples to validation studies of patient-reported outcome item banks: a simulation study},
	journal = {Quality of Life Research},
	volume = {25},
	number = {7},
	year = {2016},
	pages = {1635{\textendash}1644},
	abstract = {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.},
	issn = {1573-2649},
	doi = {10.1007/s11136-015-1199-9},
	url = {https://doi.org/10.1007/s11136-015-1199-9},
	author = {Smits, Niels}
}
