SAS Keep Statement
Used in the datastep, the keep statement explicitly specifies which variables are to be retained in the data set. Example:
data score;
infile `c:\courses\mh160.dat';
input last $ first $ m1-m3 final;
grade=0.2*m1+0.2*m2+0.2*m3+0.4*final; 公卫论坛
keep last first grade;
run;
The data set score will contain only the 3 variables last, first, and grade. If the keep statement were not used, the data set would contain 7 variables: last, first, m1, m2, m3, final, and grade.
It is preferable to use the keep= data set option.
data score;
infile `c:\courses\mh160.dat';
input last $ first $ m1-m3 final;
grade=0.2*m1+0.2*m2+0.2*m3+0.4*final; 公卫论坛
keep last first grade;
run;
The data set score will contain only the 3 variables last, first, and grade. If the keep statement were not used, the data set would contain 7 variables: last, first, m1, m2, m3, final, and grade.
It is preferable to use the keep= data set option.
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