[R] Random Block

[arun]

Hi,
Please post in plain text and show the example using ?dput.


Assuming that you wanted a "data.frame" and not a "list"

May be this helps:

set.seed(428)
dat1 <- data.frame(`block identifier`=rep(1:40,each=12),`block size`=12,`sequence within block`=rep(1:12,40), treatment=sample(paste("Group", LETTERS[1:2]), 12*40, replace=TRUE),age65= rep(sample(c("yes","no"), 40, replace=TRUE),each=12), surgery = rep(sample(c("yes","no"),40, replace=TRUE), each=12), smoke=rep(sample(c("Yes","No"), 40, replace=TRUE), each=12), check.names=FALSE,stringsAsFactors=FALSE)


A.K.



Dear R-listers,
I am using R 3.1, I amtrying to generate 40 patients in each treatment group with 12 block,  Equal number of treatment in each block ,using stratification Variable age65(yes, no),surgery(yes ,no) and smoke (yes, no)
 
How can i creat like thislist in R.
 
 
 
block identifier
 
 
 
 block size
 
 
 
 sequence  within block
 
 
 
 treatment
 
 
 
 age65
 
 
 
 surgery
 
 
 
 smoke
 
 
 
 
 
1
 
 
 
12
 
 
 
1
 
 
 
Group B
 
 
 
yes
 
 
 
yes
 
 
 
Yes
 
 
 
 
 
1
 
 
 
12
 
 
 
2
 
 
 
Group A
 
 
 
yes
 
 
 
yes
 
 
 
Yes
 
 
 
 
 
1
 
 
 
12
 
 
 
3
 
 
 
Group A
 
 
 
yes
 
 
 
yes
 
 
 
Yes
 
 
 
 
 
1
 
 
 
12
 
 
 
4
 
 
 
Group B
 
 
 
yes
 
 
 
yes
 
 
 
Yes
 
 
 
 
 
1
 
 
 
12
 
 
 
5
 
 
 
Group A
 
 
 
yes
 
 
 
yes
 
 
 
Yes
 
 
 
 
 
1
 
 
 
12
 
 
 
6
 
 
 
Group B
 
 
 
yes
 
 
 
yes
 
 
 
Yes
 
 
 
 
 
1
 
 
 
12
 
 
 
7
 
 
 
Group B
 
 
 
yes
 
 
 
yes
 
 
 
Yes
 
 
 
 
 
1
 
 
 
12
 
 
 
8
 
 
 
Group A
 
 
 
yes
 
 
 
yes
 
 
 
Yes
 
 
 
 
 
1
 
 
 
12
 
 
 
9
 
 
 
Group A
 
 
 
yes
 
 
 
yes
 
 
 
Yes
 
 
 
 
 
1
 
 
 
12
 
 
 
10
 
 
 
Group B
 
 
 
yes
 
 
 
yes
 
 
 
Yes
 
 
 
 
 
1
 
 
 
12
 
 
 
11
 
 
 
Group A
 
 
 
yes
 
 
 
yes
 
 
 
Yes
 
 
 
 
 
1
 
 
 
12
 
 
 
12
 
 
 
Group B
 
 
 
yes
 
 
 
yes
 
 
 
Yes
 
 
 
 
 
2
 
 
 
12
 
 
 
1
 
 
 
Group B
 
 
 
yes
 
 
 
yes
 
 
 
no
 
 
 
 
 
2
 
 
 
12
 
 
 
2
 
 
 
Group A
 
 
 
yes
 
 
 
yes
 
 
 
no
 
 
 
 
 
2
 
 
 
12
 
 
 
3
 
 
 
Group B
 
 
 
yes
 
 
 
yes
 
 
 
no
 
 
 
 
 
2
 
 
 
12
 
 
 
4
 
 
 
Group B
 
 
 
yes
 
 
 
yes
 
 
 
no
 
 
 
 
 
2
 
 
 
12
 
 
 
5
 
 
 
Group A
 
 
 
yes
 
 
 
yes
 
 
 
no
 
 
 
 
 
2
 
 
 
12
 
 
 
6
 
 
 
Group A
 
 
 
yes
 
 
 
yes
 
 
 
no
 
 
 
 
 
2
 
 
 
12
 
 
 
7
 
 
 
Group B
 
 
 
yes
 
 
 
yes
 
 
 
no
 
 
 
 
 
2
 
 
 
12
 
 
 
8
 
 
 
Group A
 
 
 
yes
 
 
 
yes
 
 
 
no
 
 
 
 
 
2
 
 
 
12
 
 
 
9
 
 
 
Group A
 
 
 
yes
 
 
 
yes
 
 
 
no
 
 
 
 
 
2
 
 
 
12
 
 
 
10
 
 
 
Group B
 
 
 
yes
 
 
 
yes
 
 
 
no
 
 
 
 
 
2
 
 
 
12
 
 
 
11
 
 
 
Group A
 
 
 
yes
 
 
 
yes
 
 
 
no
 
 
 
 
 
2
 
 
 
12
 
 
 
12
 
 
 
Group B
 
 
 
yes
 
 
 
yes
 
 
 
no
 
 

 
I am very appreciate yourtime to answer my question
 
Thanks
Sug