ERIC Number: ED404349
Record Type: Non-Journal
Publication Date: 1996-Nov
Reference Count: N/A
Using Item "Testlets"/"Parcels" in Confirmatory Factor Analysis: An Example Using the PPSDQ-78.
Thompson, Bruce; Melancon, Janet G.
This study investigated the benefits of creating item "testlets" or "parcels" in the context of structural equation modeling confirmatory factor analysis (CFA). Testlets are defined as groups of items related to a single content area that is developed as a unit. The strategy is illustrated using data from the administration of the Personal Preferences Self-Description Questionnaire (PPSDQ-78). Testlets or item "parcels" were empirically created by combining items to create score aggregates that could be subjected to CFA analysis. Augmenting analyses by creating testlets can provide more complete understanding regarding the quality of a structural model by altering the measurement model while leaving the structural model intact. The heuristic example of testlet creation involves responses by 422 undergraduates to the PPSDQ. Items were combined through five iterations to yield data that were progressively more normally distributed. Five appendixes present descriptive statistics for the five iterations. The creation of testlets or parcels is recommended whenever data depart substantially from the distributional assumptions of CFA. (Contains 5 tables and 26 references.) (Author/SLD)
Publication Type: Reports - Evaluative; Speeches/Meeting Papers
Education Level: N/A
Authoring Institution: N/A