topic Re: Data management in SAS Programming

Change Data Structure - Transpose from long to wide

sijansap — Mon, 11 Apr 2016 02:02:19 GMT

Dear SAS users,

I have a large dataset with over 500k rows and over 100 variables (columns). However, I am interested particularlly in two columns called ID (identification) and LOC (location) assigned as values as A, B, or C. The ID column include multiple entries of same ID or sometimes single entry.

My question is, how I can create three additional columns say LOC1, LOC2, and LOC 3 of data based on oriiginal LOC. For example, say if the first ID 'A1000' has 6 entries (rows) with three rows of A, one of B, and two of C in original LOC, now I want only one row of ID 'A1000' but three additional columns (LOC1, LOC2, LOC3) with a value of 3 in LOC1, with a value of 1 in LOC2, and similarly a value of 2 in LOC3.

I would appreciate very much for any help.

Thank you in advance.

Re: Data management

Ksharp — Mon, 11 Apr 2016 01:58:13 GMT

proc freq data=sashelp.class noprint;
tables sex*age/out=temp list;
run;
proc transpose data=temp out=want;
by sex;
var count;
id age;
run;

Re: Data management

Reeza — Mon, 11 Apr 2016 02:01:14 GMT

Do you want to keep the other 100 columns or are you okay dropping them entirely?

If you can drop them, look into proc transpose.

proc sort data=have;
by id loc;
run;

proc transpose data=have out=want prefix=LOC;
by id;
var LOC;
run;

Re: Data management

sijansap — Mon, 11 Apr 2016 02:36:33 GMT

Thanks. I will try.

Re: Data management

sijansap — Mon, 11 Apr 2016 02:38:05 GMT

Thanks. I will give a try keeping just two columns.

Re: Change Data Structure - Transpose from long to wide

RW9 — Mon, 11 Apr 2016 08:39:03 GMT

Hi,

In addition to the great answers given, you could also do it in a datastep:

data want;
  set have;
  by id loc;
  array loc_{3} 8;
  retain loc_:;
  if first.loc then call missing(of loc_{*});
  select(loc);
    when("A") loc_{1}=sum(loc_{1},1);
    when("B") loc_{2}=sum(loc_{2},2);
    when("C") loc_{3}=sum(loc_{3},3);
    otherwise;
  end;
  if last.id then output;
run;

Re: Change Data Structure - Transpose from long to wide

FreelanceReinh — Mon, 11 Apr 2016 13:22:28 GMT

Hi @sijansap,

Here's another data step approach:

data want;
do until(last.id);
  set have(keep=id loc);
  by id;
  array x loc1-loc3;
  i=whichc(loc, 'A', 'B', 'C');
  if i then x{i}=sum(x{i},1);
end;
drop i loc;
run;