topic Re: split of number of subjects in SAS Programming

split of number of subjects

vraj1 — Thu, 16 Jun 2016 10:53:22 GMT

I have dataset which has the following variables.

trial_id	main_treat	comparator1	comparator2	no_of_subj	split
1	aaa	inv	none	234	1:1
2	dsd	hfg	sfdg	123	1:1:1
3	aaa	dfs	none	156	1:2

I need to replace main_treat and comp1 and comp2 with the split.

For ex for trial_id =1 it should have main_treat=234/2=117, comparator1=234/2=11 and comparator2=" ".

Can you help me in this how to do in efficient way

Re: split of number of subjects

RW9 — Thu, 16 Jun 2016 11:03:56 GMT

Hi,

I don't have access to SAS at the moment, so this is untested but (and note the reason this is so complicated is because of your data setup and having the ratio like that) :

data want;
  set have;
  array sp{3} 8.;
  do i=1 to countc(split,":")+1;
    sp{i}=input(scan(split,i,":"),best.);
  end;
  totsplit=sum(of sp{*});
  main_treat=put((no_of_subj / totsplit) * sp{1},best.);
  comparator1=put((no_of_subj / totsplit) * sp{2},best.);
  comparator2=put((no_of_subj / totsplit) * sp{3},best.);
run;

Re: split of number of subjects

vraj1 — Mon, 11 Jul 2016 06:51:20 GMT

Further to the above code i also need to set up a condition. If condition=1 then split by 1:1(half) and if condition=2 then split equally.

example for cond 2 if the value is 42 then it should be 42 for all the 3 columns.

Can any one help how to do in this code.

data want;
  set have;
  array sp{3} 8.;
  do i=1 to countc(split,":")+1;
    sp{i}=input(scan(split,i,":"),best.);
  end;
  totsplit=sum(of sp{*});
  main_treat=put((no_of_subj / totsplit) * sp{1},best.);
  comparator1=put((no_of_subj / totsplit) * sp{2},best.);
  comparator2=put((no_of_subj / totsplit) * sp{3},best.);
run;

Re: split of number of subjects

RW9 — Mon, 11 Jul 2016 08:25:48 GMT

Hi,

It would be a good idea to start a new topic, posting test data (in the form of a datastep) and what the output should look like. Your logic isn't particularly clear to me, however it should just be a matter of putting an if <> statement around the sp{*} array.