topic Re: Freeman-Halton test with a simple 3X3 table in SAS Programming

Freeman-Halton test with a simple 3X3 table

Primavera — Tue, 18 Apr 2023 20:42:40 GMT

Hi,

I am trying to do a very simple FH test using a very simple 3X3 test using SAS 9.4. When I try a 2X2 table and the chi-square test it works but my 3X3 table just gets populated with ones after running the proc freq and I get wrong answers. Here is my code:

data mydata;
   input  outcome $ msgroup $ count;
   datalines;
inc PT 6 
inc FT 11
inc surg 12
dec PT 3
dec FT 4
dec surg 2
unch PT 8
unch FT 2
unch surg 3
;
run;

proc freq data=mydata;
   tables outcome*msgroup  / chisq exact;
run;

Do you know what is happening here?

Thanks,

Re: Freeman-Halton test with a simple 3X3 table

Watts — Tue, 18 Apr 2023 21:09:11 GMT

It looks like you probably need to add a WEIGHT statement. Otherwise, each observation is assigned a frequency of 1.

Weight count;

Re: Freeman-Halton test with a simple 3X3 table

Primavera — Wed, 19 Apr 2023 15:15:33 GMT

Thank you very much. That was exactly what was missing from my proc freq.