title: Why we permute blocks?
authors.affiliation: a Department of Biostatistics, Gillings School of Global Public Health , University of North Carolina , Chapel Hill , USA.
authors.forename: Shrikant I
authors.initials: SI
authors.lastname: Bangdiwala
mesh_terms: D000818:Animals; D003627:Data Interpretation, Statistical; D006801:Humans; D023421:Models, Animal; D015233:Models, Statistical; D011897:Random Allocation; D018401:Sample Size; D012680:Sensitivity and Specificity; D013019:South Africa