How do i perform Cochran-Mantel-Haenszel test

[Sam20]

Hi everyone,

I need some help on Cochran-Mantel-Haenszel test (SAS Studio) in calculating the

1) the row mean score differ and

2) the general association for a set of data. (shown below) 

Score      below average     average        above average

Class X       1                     9              20

Class Y        3                    22             5

Class G       2                     3              25

New to SAS, so every answer would be appreciated.

Thanks,

@Sam20.

[FreelanceReinh · Accepted solution]

Hi @Sam20 and welcome to the SAS Support Communities!

The first step is to create a SAS dataset from the raw data (if not already done). The statistical tests will be done with PROC FREQ (see Example 46.7 Cochran-Mantel-Haenszel Statistics in the documentation). If the structure of the initial SAS dataset is not suitable for this procedure, you need to adapt it in an intermediate step.

Example:

/* Read raw data into SAS */

data have;
input class $7. below_av average above_av;
cards;
Class X  1   9  20
Class Y  3  22   5
Class G  2   3  25
;

/* Create input dataset for PROC FREQ */

proc transpose data=have name=score out=want(rename=(col1=n));
by class notsorted;
run;

/* Compute Cochran-Mantel-Haenszel statistics */

proc freq data=want;
label score=' ';
weight n;
tables class*score / cmh;
run;