proc tabulate如何实现显示没有数据的观测和变量

可以在 CLASS 后面加 PRELOADFMT 选项 然后在table那里加 PRINTMISS

proc tabulate data=compmiss missing;
   class country;
   class computer / preloadfmt;
   var rev90 rev91 rev92;
   table computer*country,rev90 rev91 rev92 /
         rts=32 printmiss misstext='NO DATA!';
   format country cntryfmt. computer compfmt.;
   title 'Revenues for Computer Sales';
   title2 'for 1990 to 1992';
run;