data e;
input year month$ n rem@@;
ln=log(n);
cards;
1983 jan 0 0 1983 feb 10 0 1983 mar 26 0
1983 apr 192 0 1983 may 238 0 1983 jun 374 1
1983 jul 356 0 1983 aug 358 4 1983 sep 594 0
1983 oct 786 1 1983 nov 885 2 1983 dec 981 2
1984 jan 1044 0 1984 feb 1266 1 1984 mar 1533 1
1984 apr 1510 2 1984 may 1818 2 1984 jun 2210 7
1984 jul 2003 2 1984 aug 2489 4 1984 sep 2841 2
1984 oct 3236 3 1984 nov 3104 5 1984 dec 2919 3
1985 jan 2849 3 1985 feb 3119 2 1985 mar 3596 7
1985 apr 4003 5 1985 may 4067 5 1985 jun 3690 2
1985 jul 3509 2 1985 aug 3653 9 1985 sep 4186 3
1985 oct 4562 2 1985 nov 4277 2 1985 dec 3838 2
1986 jan 4253 3 1986 feb 4242 5 1986 mar 5119 5
1986 apr 5281 7 1986 may 5163 4 1986 jun 4977 2
1986 jul 4663 4 1986 aug 5465 4 1986 sep 5314 5
1986 oct 5485 4 1986 nov 5688 6 1986 dec 5403 0
1987 jan 5749 2 1987 feb 5682 4 1987 mar 6460 3
1987 apr 6681 3 1987 may 7215 3 1987 jun 6650 8
1987 jul 7094 2 1987 aug 6600 6 1987 sep 7649 3
1987 oct 7615 9 1987 nov 6733 4 1987 dec 6540 10
1988 jan 6680 4 1988 feb 7646 6 1988 mar 8139 4
1988 apr 7829 4 1988 may 8220 3 1988 jun 7671 5
1988 jul 7120 3 1988 aug 7293 4 1988 sep 8045 5
1988 oct 8567 3 1988 nov 7682 6 1988 dec 7048 3
1989 jan 7369 2 1989 feb 7270 6 1989 mar 8124 1
1989 apr 7636 5 1989 may 7512 5 1989 jun 7049 4
1989 jul 7286 2 1989 aug 7624 2 1989 sep 7623 2
1989 oct 7970 5 1989 nov 7569 1 1989 dec 7156 10
1990 jan 7404 3 1990 feb 7447 8 1990 mar 7951 12
1990 apr 8056 7 1990 may 7742 3 1990 jun 7109 2
1990 jul 7229 4 1990 aug 7249 3 1990 sep 7366 0
1990 oct 7955 6 1990 nov 7044 6 1990 dec 3929 3
;
proc genmod data=e order=data;
class month year;
model rem=month year/dist=poilink=log offset=ln type1 type3;
run;
请问这个程序如果是连续变量是否还加入class来限制year 和month呢