/* 用 proc Compare, 最简单的用法如下。其他用法在这里 */
http://support.sas.com/documentation/cdl/en/proc/61895/HTML/default/viewer.htm#a000057814.htm
* June - Best, April-better, March-Good;
proc compare data=june compare=best;
run;
proc compare data=April compare=Better;
run;
proc compare data=March compare=Good;
run;


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