This article examines the creation of contextual aggregate variables from one dataset for use with another dataset in multilevel analysis. The process of generating aggregate variables and methods of assessing the validity of the constructed aggregates are presented, together with the difficulties that this approach presents.
Chowhan, James and Duncan, Laura
"Generating and Comparing Aggregate Variables for Use Across Datasets in Multilevel Analysis,"
Journal of Modern Applied Statistical Methods:
2, Article 29.
Available at: http://digitalcommons.wayne.edu/jmasm/vol8/iss2/29