代码如下:data sportscars;
infile 'd:\sas\exam\usedcars.dat';
input model $ year make $ seats color $;
if year<1975 then status= 'classic';
if model='corvette' then make='chevy';
if model='miata' then do;
make='mazda';
seats='2';
end;
proc print data=sportscars;
run;
但是结果出现问题,make和seats栏为什么还是有空缺值?请大家帮我看一下 谢谢!
Obs model year make seats color status
1 Corvette 1955 2 black classic
2 XJ6 1995 Jaguar 2 teal
3 Mustang 1966 Ford 4 red classic
4 Miata 2002 . silver
5 CRX 2001 Honda 2 black
6 Camaro 2000 4 red