Kolotkin RL, Williams VSL, von Huth Smith L, Meincke HH, Qin S, Williams N, Fehnel SE. Confirmatory psychometric evaluations of the impact of weight on quality of life-lite clinical trials version (IWQOL-Lite-CT). Clin Obes. 2021 Oct;11(5):e12477. doi: 10.1111/cob.12477
Ervin CM, Whalley D, von Huth Smith L, Crawford R, Dine J, Fehnel SE. Development of the impact of weight on daily activities questionnaire: a patient-reported outcome measure. Clin Obes. 2020 Dec;10(6):e12387. doi: 10.1111/cob.12387
Kolotkin RL, Williams VSL, Ervin CM, Williams N, Meincke HH, Qin S, von Huth Smith L, Fehnel SE. Validation of a new measure of quality of life in obesity trials: impact of weight on quality of life-lite clinical trials version. Clin Obes. 2019 Jun;9(3):e12310. doi: 10.1111/cob.12310
Kolotkin RL, Ervin CM, Meincke HH, Hojbjerre L, Fehnel SE. Development of a clinical trials version of the Impact of Weight on Quality of Life–Lite questionnaire (IWQOL-Lite Clinical Trials Version): results from two qualitative studies. Clin Obes. 2017 Oct;7(5):290-9. doi: 10.1111/cob.12197
Scrams DJ, McLeod LD. An expected response function approach to graphical differential item functioning. J Educ Meas. 2000 Jan 1;37(3):263-77.
Williams VSL, Rosa KR, McLeod L, Thissen D, Sanford EE. Projecting to the NAEP Scale: results from the North Carolina End‐of‐Grade Testing Program. J Educ Meas. 1998 Dec;35(4):277-96. doi: 10.1111/j.1745-3984.1998.tb00539.x
Williams VSL, Pommerich M, Thissen D. A comparison of developmental scales based on Thurstone methods and item response theory. J Educ Meas. 1998 Jun;35(2):93-107.