Journal
PSYCHOLOGICAL METHODS
Volume 18, Issue 3, Pages 285-300Publisher
AMER PSYCHOLOGICAL ASSOC
DOI: 10.1037/a0033266
Keywords
parcels; scales; items; SEM; CFA
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Funding
- NICHD NIH HHS [P30 HD002528] Funding Source: Medline
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The use of item parcels has been a matter of debate since the earliest use of factor analysis and structural equation modeling. Here, we review the arguments that have been levied both for and against the use of parcels and discuss the relevance of these arguments in light of the building body of empirical evidence investigating their performance We discuss the many advantages of parcels that some researchers find attractive and highlight, too, the potential problems that ill-informed use can incur. We argue that no absolute pro or con stance is warranted. Parcels are an analytic tool like any other. There are circumstances in which parceling is useful and those when it is not. We emphasize the precautions that should be taken when creating item parcels and interpreting model results based on parcels. Finally, we review and compare several proposed strategies for parcel building and suggest directions for further research.
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