realized in realizable entity study design complete randomization completely randomized design http://animsci.agrenv.mcgill.ca/StatisticalMethodsII/R/crd/index.html a completely randomized design is a type of design of experiment where the observation unit receive treatments (independent variable level) entirely at random. In other words, the observations unit are randomly assigned to treatments. Completely randomized designs differ from randomized complete block design and should not be confused as in the latter, a blocking variable is first use to assign experimental units to blocks. Then only, the members of each block are then randomly assigned to different treatment groups adapted from http://www.stat.yale.edu/Courses/1997-98/101/expdes.htm and from A Dictionary of Statistics (3 ed.) , Graham Upton and Ian Cook Publisher: Oxford University Press Print Publication Date: 2014 Print ISBN-13: 9780199679188 Philippe Rocca-Serra term request by Hanna Cwiek, https://github.com/ISA-tools/stato/issues/61 https://www.ncbi.nlm.nih.gov/pubmed/24033541 "An experiment was conducted to investigate the effect of a prebiotic on performance of partridge. The experiment was carried out with a total of eighty-day-old male Chukar partridge (Alectoris chukar chukar) chicks in a completely randomized design. The dietary treatments consisted of a control and an experimental treatment, and each treatment was replicated four times with 10 chicks per replicate." ready for release