title: Randomization by cluster.
authors.affiliation: Department of Epidemiology and Biostatistics, University of California, San Francisco.
authors.forename: W W
authors.initials: WW
authors.lastname: Hauck
authors.forename: C L
authors.initials: CL
authors.lastname: Gilliss
authors.forename: A
authors.initials: A
authors.lastname: Donner
authors.forename: S
authors.initials: S
authors.lastname: Gortner
mesh_terms: D000704:Analysis of Variance; D016000:Cluster Analysis; D003627:Data Interpretation, Statistical; D004526:Efficiency; D004993:Ethics, Nursing; D006801:Humans; D015999:Multivariate Analysis; D015399:Nursing Research / Q000379:methods / Q000592:standards*; D011897:Random Allocation; D012107:Research Design / Q000592:standards*; D015983:Selection Bias