将数据转置为行，多列

Question

My data looks like below:

ID   Month  Variable
1     1        Y
1     2        N
1     3        Y
2     1        Y
2     2        Y 
2     3        Y

I need to transpose it such that the ID and month are in rows and Variable values in columns Outputdata:

ID  Month   Variable_Y  Variable_N
1     1       Y
1     2                     N
1     3       Y
2     1       Y
2     2       Y
2     3       Y

How do I do this?

Answer 1

Using the PROC TRANSPOSE it's pretty straightforward.

proc transpose data=from out=transposed (drop=_name_)
 prefix=variable_
;
 by id month;
 id variable;
 var variable;
run; 

Answer 2

Or using a datastep:

data test_output (drop = variable);
  set test_input;
  format Variable_Y Variable_N $1.;

  if variable = "Y" then do;
     Variable_Y = "Y";
     call missing (Variable_N);
  end;

  else if variable = "N" then do;
     Variable_N = "N";
     call missing (Variable_Y);
  end;

 run;