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Activity Number: 259
Type: Contributed
Date/Time: Monday, August 5, 2013 : 2:00 PM to 3:50 PM
Sponsor: Section on Statistical Consulting
Abstract - #310075
Title: Statistical Consulting and Scale Development: Refinement Without Loss of Precision
Author(s): Richard Ittenbach*+ and Resmi Gupta and Kim D. Barber Foss and Gregory D. Myer
Companies: Cincinnati Children's Hospital Medical Center and Cincinnati Children's Hospital Medical Center and Cincinnati Children's Hospital Medical Center and Cincinnati Children's Hospital Medical Center
Keywords: validation ; Rasch analysis ; test development ; psychometrics
Abstract:

Consulting with clients in academic medical centers brings with it many challenges. Whether one is interested in screening instruments or more formal diagnostic measures, statisticians are increasingly being asked to offer guidance with respect to measure and scale development. The purpose of this presentation will be to offer consulting statisticians a strategy that can be used when working with clients seeking help refining and validating existing measures. Beginning with the presenting concerns of the client, attention will be devoted to the design of the study, item functioning and fit-statistics, and, finally, construct validation. Data from a prospective, epidemiologic study to diagnose patellofemoral knee pain (PFP) among female athletes using the Anterior Knee Pain Scale (AKPS) will be used as an example. The AKPS was reduced from 13 items (aCoeff=0.77, sSEM=0.004) to 6 items (aCoeff=0.78, sSEM=0.004). Point-biserial correlations with PFP diagnosis were comparable: r[498]=0.70 (R2=0.49, short form) and r[498]=0.71 (R2=0.51, long form), as were sensitivity: 84% (short form) and 80% (long form), and specificity: 89% (short form), 90% (long form)(AUC=0.94 both).


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