Wang, Jichuan Using SAS to conduct nonparametric residual bootstrap multilevel modeling with a small number of groups. [electronic resource] - Computer methods and programs in biomedicine May 2006 - 130-43 p. digital Publication Type: Journal Article ISSN: 0169-2607 Standard No.: 10.1016/j.cmpb.2006.02.006 doi Subjects--Topical Terms: Models, StatisticalStatistics, Nonparametric