The PROMIS Social Function-Ability Short Form in Diverse Cancer Populations: DIF Identification and Impact

Project: Research project

Project Details

Description

I. Full Title: The PROMIS Social Function-Ability Short Form in Diverse Cancer Populations: DIF Identification and Impact

II. Writing Group (list individual with lead responsibility first)
Lead Author: Elizabeth Hahn
Address: 633 N. St. Clair, Suite 1900, Chicago, IL 60611
Phone: (312) 503-9804
E-mail: e-hahn@northwestern.edu Fax: (312) 503-9800
Co-Authors: Michael Kallen
Statisticians: Michael Kallen


III. Background: Measures of social health will play a key role in applications that use ecologic (or determinants of health) models that emphasize how patients’ environments influence their health. It is essential to identify social health measures that can be used across diverse populations.


IV. Main Manuscript Question(s): Does the PROMIS 10-item Social Function-Ability Short Form exhibit measurement invariance vis-à-vis diverse populations (e.g., race/ethnicity, age, cancer, language)?


V. Analytic plan (brief): The R package “lordif” will be used to identify DIF-by-population (e.g., by race/ethnicity, age, cancer, language) items via a pseudo-R2 change criterion of 0.01. Unpurified vs. DIF-purified theta scores will then be analyzed to determine DIF impact on scores.


VI. Timeline
Initial Psychometric Analyses: Dec-Jan 2014
DIF Analyses: Feb-Mar 2014
Manuscript Writing: Apr-June 2014
StatusFinished
Effective start/end date8/1/137/31/14

Funding

  • Georgetown University (RX 4442-007-NU//5U01AR57971-04)
  • National Institute of Arthritis and Musculoskeletal and Skin Diseases (RX 4442-007-NU//5U01AR57971-04)

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