SAS Coding Issue

[zahidhasandipu]

/*In the study below, each participant was given four drugs and measured on three variables, 

how nauseous they felt, how much pain they were in, and how easily they fell asleep, all rated on a scale

of 1 to 15. I am only interested in the nausea rating, so I conducted the analysis below. */

What did I do incorrectly here?

DATA sickstudy;

INPUT #1 @1    PARTICIPANT     2.

         @5    DRUG            1.

         @10   NAUSEA          2.

         @15   SLEEP           2.

         @20   PAIN            2. ;

DATALINES;

01  1    08   10   10

02  1    10   13   12

03  1    07   10   12

04  1    06   09   10

01  3    07   08   09

02  3    11   15   14

03  3    08   10   09

04  3    05   08   08

01  4    12   11   12

02  4    09   12   12

03  4    10   14   13

04  4    07   12   11

01  2    08   08   09

02  2    13   14   14

03  2    11   11   12

04  2    07   08   07

;

Title "Nausea test" ;

PROC GLM  DATA=sickstudy;

   CLASS GROUP;

   MODEL NAUSEA  = DRUG ;

RUN;

[Astounding · Accepted solution]

The big issue:  GROUP is not a variable in your data set.  It should not appear on a CLASS statement.

Likely, you should be using:

CLASS DRUG;

Minor issues:  #1 doesn't contribute to the working of the program.  Those two characters can be removed.  And PARTICIPANT should probably be a character variable.  To make that happen, use:

INPUT @1 PARTICIPANT $ 2.    .....................