04-15-2018 02:21 PM - edited 04-15-2018 02:22 PM
I want to create a crosstabulation table between Region and season:
I want to:
Check if the % of people in region 1 is different between spring and summer (p-value or OR)
Check if the % of people in region 2 is different between spring and summer (p-value or OR)
Check if the % of people in region 3 is different between spring and summer (p-value or OR)
What test should I use to get the 3 p-values needed?
04-15-2018 02:30 PM
As far as I remember, a simple comparison of proportions as you describe (which is not really a 2x2 contingency table at all) is not programmed into any SAS PROC. However, it is simple enough to program in data step.
As is usual, @Rick_SAS has written up the explanation at https://blogs.sas.com/content/iml/2017/07/05/test-equality-two-proportions-sas.html
04-15-2018 03:25 PM
It's not a 2X2 table, since it's literally a 1 (row=REGION) X 2 (column=SEASON) comparison.
One way would be to use a BY statement in the PROC FREQ.
Here's an example that gets the binomial test, which tests that the proportions should be 50% in each group. Note that you'll need the N's here, NOT the percentages. You need both the N and percentages or the raw data.
proc sort data=sashelp.class out=class; by age sex; run; ods output binomialTest=pvalues; proc freq data=class; by age; table sex / out=summary_table chisq binomial; run;
PS. The reusults are not in a nice neat table, but all the information is in the two output tables: