Korean J Anesthesiol 2019 June 72(3): 221-232
https://doi.org/10.4097/kja.19049
The Appendix of this article contained an error throughout in which an incorrect symbol was used for the assignment: it should be <- characters (which is the gets arrow in R), and not ← symbol in the command lines.
For example, the corrected command lines are as below:
> N <- 1000
> K <- 3
> (rand <- crPar(N, K))
Object of class "crPar"
design = CR
N = 500
K = 3
groups = A B C
The authors would like to apologize for any inconvenience caused.