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  1. Article

    Open Access

    Unsupervised item response theory models for assessing sample heterogeneity in patient-reported outcomes measures

    Unsupervised item-response theory (IRT) models such as polytomous IRT based on recursive partitioning (IRTrees) and mixture IRT (MixIRT) models can be used to assess differential item functioning (DIF) in pati...

    Tolulope T. Sajobi, Ridwan A. Sanusi, Nancy E. Mayo in Quality of Life Research (2024)

  2. Article

    Open Access

    Transitions between versions of the International Classification of Diseases and chronic disease prevalence estimates from administrative health data: a population-based study

    Diagnosis codes in administrative health data are routinely used to monitor trends in disease prevalence and incidence. The International Classification of Diseases (ICD), which is used to record these diagnos...

    Ridwan A. Sanusi, Lin Yan, Amani F. Hamad, Olawale F. Ayilara in BMC Public Health (2022)

  3. No Access

    Article

    On designing Maxwell CUSUM control chart: an efficient way to monitor failure rates in boring processes

    The ordinary CUSUM chart is based on normality assumption. But in real-life phenomenon such as monitoring of lifetime variable, this assumption is not always valid. Hence, a variant of the CUSUM chart, the VCU...

    M. Pear Hossain, Ridwan A. Sanusi in The International Journal of Advanced Manu… (2019)