Creating block randomisation scheme

Dyllan — Fri, 25 Aug 2017 11:32:53 GMT

Hello,

I'm trying to create a block randomisation scheme. I've managed to create something very close to what I want, except I would like the subject var to be blank instead of the numbers 1-3. I'm a complete noob when it comes to SAS so any help is much appreciated. I use SAS studo v9.4

Many thanks,

Dyllan

Code:

data _null_;
x=round(ranuni(0)*1000000);
call symput ('seed', x);title "3 arm trial randomisation scheme.";
run;
title "3 arm trial randomisation scheme.";
proc plan;
factors block=100 ordered subject=3 ordered/noprint;
treatments treatment=3 random;
output out=out
treatment cvals=('A' 'B' "C");

run;
proc print data=out noobs;
var block treatment subject;

run;

Re: Creating block randomisation scheme

ballardw — Fri, 25 Aug 2017 17:20:18 GMT

You have at least two possible approaches depending on how you will actually use the the out dataset, change the value which will be data step, or a format so the displayed value is blank.

/* to actually change the value*/
data out1;
  set out; 
  call missing (subject);
run;
/* missing may be represented by other characters than .
   to show blank*/
options missing=' ';
proc print data=out1 noobs;
var block treatment subject;

run;
options missing='.';
/* or use a format to change the display*/
proc format library=work;
value blank
low-high=' '
;
run;
proc print data=out noobs;
   var block treatment subject;
   format subject blank.;
run;

If you are going to do this frequently then the format approach may be preferred if using the proc print output. Otherwise use the data change.

topic Creating block randomisation scheme in Statistical Procedures

Creating block randomisation scheme

Re: Creating block randomisation scheme