我运行了一下CODE但是结果与你的少有不同。如下：

10   data b (keep=obs name sex);
11   do n=3,5,7,4;
12   set sashelp.class point=n;
13   output;
14   end;
15   stop;
WARNING: The variable obs in the DROP, KEEP, or RENAME list has never been referenced.
NOTE: The data set WORK.B has 4 observations and 2 variables.
NOTE: DATA statement used (Total process time):
      real time           24.63 seconds
      cpu time            0.81 seconds



做了更改：去掉 obs 之后就好了。如下：
58   data b (keep=name sex);
59   do n=3,5,7,4;
60   set sashelp.class point=n;
61   output;
62   end;
63   stop;
64   run;
NOTE: The data set WORK.B has 4 observations and 2 variables.
NOTE: DATA statement used (Total process time):
      real time           0.01 seconds
      cpu time            0.01 seconds