SAS问题：我有一个表有一列名为：Primary_coverage有4个观察，如下所示，
Primary_coverage 合并单一限额 没有保险的驾车人士 医 身体受伤
我想创建一个宏来循环遍历Year，Quarter，Month和column值，以便我的表值看起来如下所示：（2000Q1到2002Q4 = 36个月，12个季度，3年） 注意：最早的年份总是从2000Q1开始
year quarter Primary_coverage months 2000 1 combined single limit 36 2000 2 combined single limit 33 2000 3 combined single limit 30 2000 4 combined single limit 27 2001 1 combined single limit 24 2001 2 combined single limit 21 2001 3 combined single limit 18 2001 4 combined single limit 15 2002 1 combined single limit 12 2002 2 combined single limit 9 2002 3 combined single limit 6 2002 4 combined single limit 3 2000 1 uninsured motorist 36 2000 2 uninsured motorist 33 2000 3 uninsured motorist 30 2000 4 uninsured motorist 27 2001 1 uninsured motorist 24 2001 2 uninsured motorist 21 2001 3 uninsured motorist 18 2001 4 uninsured motorist 15 2002 1 uninsured motorist 12 2002 2 uninsured motorist 9 2002 3 uninsured motorist 6 2002 4 uninsured motorist 3 2000 1 Medical 36 2000 2 Medical 33 2000 3 Medical 30 2000 4 Medical 27 2001 1 Medical 24 2001 2 Medical 21 2001 3 Medical 18 2001 4 Medical 15 2002 1 Medical 12 2002 2 Medical 9 2002 3 Medical 6 2002 4 Medical 3 2000 1 Bodily Injury 36 2000 2 Bodily Injury 33 2000 3 Bodily Injury 30 2000 4 Bodily Injury 27 2001 1 Bodily Injury 24 2001 2 Bodily Injury 21 2001 3 Bodily Injury 18 2001 4 Bodily Injury 15 2002 1 Bodily Injury 12 2002 2 Bodily Injury 9 2002 3 Bodily Injury 6 2002 4 Bodily Injury 3
但是当我在2003Q2上运行相同的程序时我的表应如下所示：（2000Q1至2003Q2 = 42个月，14个季度，3年）
year quarter Primary_coverage months 2000 1 combined single limit 42 2000 2 combined single limit 39 2000 3 combined single limit 36 2000 4 combined single limit 33 2001 1 combined single limit 30 2001 2 combined single limit 27 2001 3 combined single limit 24 2001 4 combined single limit 21 2002 1 combined single limit 18 2002 2 combined single limit 15 2002 3 combined single limit 12 2002 4 combined single limit 9 2003 1 combined single limit 6 2003 2 combined single limit 3 2000 1 uninsured motorist 42 2000 2 uninsured motorist 39 2000 3 uninsured motorist 36 2000 4 uninsured motorist 33 2001 1 uninsured motorist 30 2001 2 uninsured motorist 27 2001 3 uninsured motorist 24 2001 4 uninsured motorist 21 2002 1 uninsured motorist 18 2002 2 uninsured motorist 15 2002 3 uninsured motorist 12 2002 4 uninsured motorist 9 2003 1 uninsured motorist 6 2003 2 uninsured motorist 3 2000 1 Medical 42 2000 2 Medical 39 2000 3 Medical 36 2000 4 Medical 33 2001 1 Medical 30 2001 2 Medical 27 2001 3 Medical 24 2001 4 Medical 21 2002 1 Medical 18 2002 2 Medical 15 2002 3 Medical 12 2002 4 Medical 9 2003 1 Medical 6 2003 2 Medical 3 2000 1 Bodily Injury 42 2000 2 Bodily Injury 39 2000 3 Bodily Injury 36 2000 4 Bodily Injury 33 2001 1 Bodily Injury 30 2001 2 Bodily Injury 27 2001 3 Bodily Injury 24 2001 4 Bodily Injury 21 2002 1 Bodily Injury 18 2002 2 Bodily Injury 15 2002 3 Bodily Injury 12 2002 4 Bodily Injury 9 2003 1 Bodily Injury 6 2003 2 Bodily Injury 3
答案 0 :(得分：0)
使用日期函数的组合来实现此目的。使用INTNX递增/递减日期，使用input（）将YYYYQQ转换为SAS日期。
循环是否直截了当。
%let end_date = 2003Q2;
data date_list;
format end_date date9. coverage $20.;
end_date=input("&end_date", yyq6.);
n_months=intck('month', '01Jan2000'd, end_date)+3;
do coverage='Primary', 'Secondary', 'Tertiary';
date=end_date;
do months=n_months to 3 by -3;
year=year(date);
quarter=qtr(date);
date=intnx('month', date, -3, 'b');
output;
end;
end;
Keep year quarter months coverage;
run;