Chi-sqaure test

[sumah]

[sumah]

I have run a Ch-sqaures test on these variables. that was the SAS output categories for both variables are (yes vs no). why another row (No) didn't show in the table? Can I run chi-squares if one variable has 0 obs in one category?

[SASKiwi]

Most likely you will see something like this in your SAS log. You need at least two non-missing  categories for both of your variables to do the Chi Square test.

34         proc freq data = sashelp.class;
35           where Sex = 'F';
36           table age * sex / chisq;
37         run;

NOTE: No statistics are computed for Age * Sex since Sex has less than 2 nonmissing levels.
NOTE: There were 9 observations read from the data set SASHELP.CLASS.
      WHERE Sex='F';
NOTE: PROCEDURE FREQ used (Total process time):
      real time           0.09 seconds
      cpu time            0.04 seconds