topic Re: Retaining character value across same ID in SAS Programming

Retaining character value across same ID

ItsAProccess — Tue, 05 Oct 2021 02:31:10 GMT

Hi,

I am struggling to retain a value of "Y" for all observations by ID if the value "Y" exists for any record within the same ID:

For example, my data looks like this:

ID	indicator1	indicator2	indicator3	indicator4	indicator5
001		Y
001	Y
001			Y
001					Y
002	Y
002			Y
002		Y
002
002				Y

but I want it to look like this within the indicatorXnew fields:

ID	indicator1	indicator2	indicator3	indicator4	indicator5	indicator1new	indicator2new	indicator3new	indicator4new	indicator5new
001		Y				Y	Y	Y		Y
001	Y					Y	Y	Y		Y
001			Y			Y	Y	Y		Y
001					Y	Y	Y	Y		Y
002	Y					Y	Y	Y	Y
002			Y			Y	Y	Y	Y
002		Y				Y	Y	Y	Y
002						Y	Y	Y	Y
002				Y		Y	Y	Y	Y

I have some familiarity with RETAIN but only for summing numeric values. I would share code but nothing I try works correctly, but here is the code to generate data set HAVE:

data HAVE;
infile datalines dlm='|' truncover;
input ID$ indicator1$ indicator2$ indicator3$ indicator4$ indicator5$;
datalines;
001|| ||Y|| || || ||
001||Y|| || || || ||
001|| || ||Y|| || ||
001|| || || || || Y
002||Y|| || || || ||
002|| || ||Y|| || ||
002|| ||Y|| || || ||
002|| || || || || ||
002|| || || ||Y|| ||
;run;

I would appreciate any help, thank you

Re: Retaining character value across same ID

Patrick — Tue, 05 Oct 2021 03:45:29 GMT

Here you go.

data have;
  infile datalines dlm='|' truncover;
  input ID $ (indicator1 indicator2 indicator3 indicator4 indicator5) (:$1.);
  datalines;
001|| ||Y|| || || ||
001||Y|| || || || ||
001|| || ||Y|| || ||
001|| || || || || Y
002||Y|| || || || ||
002|| || ||Y|| || ||
002|| ||Y|| || || ||
002|| || || || || ||
002|| || || ||Y|| ||
;

proc sort data=have;
  by id;
run;

data inter;
  set have;
  by id;
  array ind{*} indicator1-indicator5;
  array new_ind{*} $1 new_indicator1-new_indicator5;
  retain new_ind;
  keep id new_indicator1-new_indicator5;
  do i=1 to dim(new_ind);
    if ind[i]='Y' then new_ind[i]='Y';
  end;
  if last.id then
    do;
      output;
      call missing(of new_ind[*]);
    end;
run;

data want;
  merge have inter;
  by id;
run;

And here an alternative coding option.

data want2;
  set have;
  by id;
  array ind{*} indicator1-indicator5;
  array new_ind{*} $1 new_indicator1-new_indicator5;
  retain new_ind;

  if first.id then 
    do;
      call missing(of new_ind[*]);
      do until(last.id);
        set have;
        by id;
        do i=1 to dim(new_ind);
          if ind[i]='Y' then new_ind[i]='Y';
        end;
      end;
    end;
  drop i;
run;

Re: Retaining character value across same ID

Tom — Tue, 05 Oct 2021 04:54:31 GMT

Collapse to one record per BY group. If your variables are really coded as Y or missing then you could use UPDATE statement to do the collapsing. The UPDATE statement will ignore the missing values when applying the transaction observations.

data summary;
  update have(obs=0) have;
  by id;
run;

If you then need those variable renamed and remerged onto the detailed records use a MERGE statement. If you have a series of variables with a numeric counter it works much better to have the counter as a suffix so that you can use a variable list.

data want;
  merge have summary(rename=(indicator1-indicator5=new_indicator1-new_indicator5));
  by id;
run;

Re: Retaining character value across same ID

Ksharp — Tue, 05 Oct 2021 06:45:05 GMT

data have;
  infile datalines dlm='|' truncover;
  input ID $ (indicator1 indicator2 indicator3 indicator4 indicator5) (:$1.);
  datalines;
001|| ||Y|| || || ||
001||Y|| || || || ||
001|| || ||Y|| || ||
001|| || || || || Y
002||Y|| || || || ||
002|| || ||Y|| || ||
002|| ||Y|| || || ||
002|| || || || || ||
002|| || || ||Y|| ||
;
proc sql;
create table want as
select *,
max(indicator1) as new1,
max(indicator2) as new2,
max(indicator3) as new3,
max(indicator4) as new4,
max(indicator5) as new5
from have
group by id;
quit;

Re: Retaining character value across same ID

Astounding — Tue, 05 Oct 2021 11:12:35 GMT

Here's a variation that is such an odd duck, you might not see it again:

data want;
   do until (last.id);
      update have (obs=0) have;
      by id;
   end;
   indicator1new = indicator1;
   indicator2new = indicator2;
   indicator3new = indicator3;
   indicator4new = indicator4;
   indicator5new = indicator5;
   do until (last.id);
      set have;
      by id;
      output;
   end;
run;