DATASET中有很多MISSING value， proc reg by 时在LOG WINDOW就弹出很多ERROR MESSAGE:

ERROR: No valid observations are found.
NOTE: The above message was for the following BY group:
      id=10 startmonth=199603

SAS 程序中都已经都加了options nonotes nosource nosource2 errors=0;  还会在LOG WINDOW窗口中显示ERROR MESSAGE.太多的MISSING VALUE，循环50次(总共需要循环到2000），SAS log window就满了。



已解决 :-)