• The PHO Mission is to improve health outcomes by developing, maintaining, improving and encouraging the application of the Patient Reported Outcomes Measurement Information System in research and clinical practice. 

  • Methods and Implications of Differential Item Functioning

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    Name: Methods and Implications of Differential Item Functioning
    Date: April 16, 2019
    Time: 9:00 AM - 10:00 AM CDT
    Registration: Register Now
    Event Description:
    Host: Aaron Kaat, PhD
    Northwestern University


    The PROMIS standard for differential item functioning (DIF) has been hybrid logistic ordinal regression (i.e. lordif). However, several PROMIS banks, such as the smoking banks have used other DIF procedures. Testing for DIF is especially relevant to the PHO, insofar as there have been proposals to require DIF evaluations for translated versions. It is common for different DIF methods to flag different items, without knowing which is correct. This webinar will explore multiple methods for DIF detection, using a simulation study that allows direct methodological comparisons. It will also consider options for addressing DIF, and potential implications for PROMIS.
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