【SAS NOTE】MEANS

1 data mysas.ifthen11;
2     infile 'e:\ifthen.txt' firstobs=2;
3     input date yymmn6. gtone shen dong all;
4     year=year(date);
5     run;
6 proc means data=mysas.ifthen11 max min n nmiss sum range ;
7     by year;
8     where year(date)<=2011;
9 run;

means过程很适合统计月度或年度数据。在常规分析中会经常用到。

其中by字句做归类，where 做筛选。