JSM 2015 Online Program

Online Program Home
My Program

Abstract Details

Activity Number: 356
Type: Contributed
Date/Time: Tuesday, August 11, 2015 : 10:30 AM to 12:20 PM
Sponsor: Mental Health Statistics Section
Abstract #315364 View Presentation
Title: A Weighted Summed Score for the Center for Epidemiologic Studies: Depression Scale for Systemic Sclerosis
Author(s): Daphna Harel* and Russell Steele and Brett Thombs and Murray Baron and Marie Hudson
Companies: New York University and McGill University and McGill University and Jewish General Hospital and Jewish General Hospital
Keywords: Center for Epidemiological Studies Depression Scale ; Generalized Partial Credit Model ; Weighted Summed Score ; Summed Score ; Item Response Theory ; Systemic Sclerosis

The Center for Epidemiological Studies Depression scale is a multi-item instrument commonly used to measure depression. Item response theory provides a class of models that link observed item scores to an underlying latent trait, such as depression. The traditional use of a total summed score to summarize item score is linked to the partial credit model (PCM) and is shown to be a form of model misspecification in this case. A discrimination-parameter weighted summed score (WSS) is proposed, based on a sample of n = 1278. The WSS is both the minimally sufficient statistic for the estimation of the latent trait and satisfies the monotone likelihood ratio under a Generalized PCM. In patients with chronic illness, such as Systemic Sclerosis (SSc), the measurement of depression is further complicated by disease-related symptoms. Item weighting allows for a measure of depression, and resulting intervention strategies, tailored to this population. The weights show high levels of face validity and reliability and provide meaningfully different ratings of depression. This methodology serves as a guide for the creation of better summary measures for other instruments and other populations.

Authors who are presenting talks have a * after their name.

Back to the full JSM 2015 program

For program information, contact the JSM Registration Department or phone (888) 231-3473.

For Professional Development information, contact the Education Department.

The views expressed here are those of the individual authors and not necessarily those of the JSM sponsors, their officers, or their staff.

2015 JSM Online Program Home