CODEWITHSUNDEEP
r
thakkar
thakkar

Reputation: 11

Random Assignment of Groups

How do I randomly assign a group of people into four treatment groups and a control group, given that I have a list of their names on an excel document?

Upvotes: 1

Views: 5654

Answers (2)

Alex Coppock
Alex Coppock

Reputation: 2252

Get the randomizr package

install.packages("randomizr")
library(randomizr)

use complete random assignment (holds the number of units assigned to each condition fixed across randomizations, unlike sample with replace = TRUE

Z <- complete_ra(N = 100, num_arms = 5)
table(Z)

Upvotes: 4

Jonathan Carroll
Jonathan Carroll

Reputation: 3947

If you have 100 names (number them as such) then you can assign them to one of 5 groups with 

split(1:100, sample(1:5, 100, replace = TRUE))

split(x, f) splits x into groups according to f, for which I've used sample to sample 100 occurrences of the numbers 1 to 5 (with replacement).

Take these numbered names from your list.

(Note: you didn't specify equal groups).

Alternatively, the caret package can handle this quite nicely for you: https://topepo.github.io/caret/data-splitting.html

Upvotes: 1

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