请教各位大侠:
为何我写了下面的format语句,结果中却并没有显示?
proc format;
value $yrfmt
’1’=’freshman’
’2’=’sophomore’
’3’=’junior’
’4’=’senior’;
run;
data debate;
input name $ gender $ year $ gpa @@;
format year $yrfmt.;
datalines;
Capiccio m 1 3.598 Tucker m 1 3.901
Bagwell f 2 3.722 Berry m 2 3.198
Metcalf m 2 3.342 Gold f 3 3.609
Gray f 3 3.177 Syme f 3 3.883
Baglione f 4 4.000 Carr m 4 3.750
Hall m 4 3.574 Lewis m 4 3.421
;
感谢之至