CONDITIONAL SELECTION OF COMBINATIONS OF THREE VARIABLES USING ARRAY

Cruise — Mon, 19 Jun 2017 22:15:46 GMT

I have to select patients who has specific combinations of conditions as following:

1. patients with both P2 and the Pa;

2. patients with both the P3 and the Pa;

Patients must have P2 and P3 with the Pa to be eligible. Simply put: P2+Pa, P3+Pa, P2+P3+Pa combinations are acceptable.

data combinations; set have;
 array diagnosis[*] condition othercondition_1-othercondition_24;
  do i = 1 to dim(diagnosis);
   if diagnosis[i] in ('P2','P3') then x=1; 
   if diagnosis[i] in ('Pa')      then y=1;
   if x=1 and y=1 then output;
  end;
  drop i;
run;

However, resulting data "combinations" has an information for single subject (row) repeated 20 times. Very strange. Any idea why that happened?

LOG:

There were 95560 observations read from the data set WORK.HAVE.
NOTE: The data set WORK.COMBINATIONS has 20 observations and 66 variables.

Using SAS 9.4.

Re: CONDITIONAL SELECTION OF COMBINATIONS OF THREE VARIABLES USING ARRAY

Reeza — Mon, 19 Jun 2017 22:24:40 GMT

Use WHICHC() to create flags for each of your three variables and then use those variables to do your conditioning.

Re: CONDITIONAL SELECTION OF COMBINATIONS OF THREE VARIABLES USING ARRAY

Astounding — Mon, 19 Jun 2017 22:38:04 GMT

A simple solution: move the OUTPUT statement. Instead of coding it inside the DO loop, move it to after the END statement.

topic CONDITIONAL SELECTION OF COMBINATIONS OF THREE VARIABLES USING ARRAY in SAS Programming

CONDITIONAL SELECTION OF COMBINATIONS OF THREE VARIABLES USING ARRAY

Re: CONDITIONAL SELECTION OF COMBINATIONS OF THREE VARIABLES USING ARRAY

Re: CONDITIONAL SELECTION OF COMBINATIONS OF THREE VARIABLES USING ARRAY