title: Methods and analysis of realizing randomized grouping.
abstract: Randomization is one of the four basic principles of research design. The meaning of randomization includes two aspects: one is to randomly select samples from the population, which is known as random sampling; the other is to randomly group all the samples, which is called randomized grouping. Randomized grouping can be subdivided into three categories: completely, stratified and dynamically randomized grouping. This article mainly introduces the steps of complete randomization, the definition of dynamic randomization and the realization of random sampling and grouping by SAS software.
authors.affiliation: Consulting Center of Biomedical Statistics, Academy of Military Medical Sciences, Beijing 100850, China. lphu812@sina.com
authors.forename: Liang-Ping
authors.initials: LP
authors.lastname: Hu
authors.forename: Xiao-Lei
authors.initials: XL
authors.lastname: Bao
authors.forename: Qi
authors.initials: Q
authors.lastname: Wang
mesh_terms: D011897:Random Allocation; D016032:Randomized Controlled Trials as Topic / Q000379:methods*; D012985:Software Design