Which program creates this output?
A. proc freq data = test;
tables gender*answer/nocol norow nopercent;
run;
B. proc freq data = test;
tables answer*gender/nocol norow nopercent;
run;
C. proc freq data = test;
tables gender*answer/nocol norow nopercent missing;
run;
D.proc freq data = test;
tables answer*gender/nocol norow nopercent missing;
run;
答案是A为什么不是C呢?明明表格下方有对Frequency Missing=4的统计呢?



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