Here it is my data file. And I run the following code data work.final;    infile temp1 missover;    input date nasins $ @;    count=0;    do while (nasins ne ' ');    count+1;    output;    input nasins $ @;    end; run; proc print data=work.final; run; The log shows the following 870  data work.final; 871     infile temp1 missover; 872     input date nasins $ @; 873     count=0; 874     do while (nasins ne ' '); 875     count+1; 876     output; 877     input nasins $ @; 878     end; 879  run; ERROR: No logical assign for filename TEMP1. NOTE: The SAS System stopped processing this step because of errors. WARNING: The data set WORK.FINAL may be incomplete.  When this step was stopped there were 0          observations and 3 variables. WARNING: Data set WORK.FINAL was not replaced because this step was stopped. NOTE: DATA statement used (Total process time):       real time           0.00 seconds       cpu time            0.00 seconds 880  proc print data=work.final; 881  run; NOTE: No observations in data set WORK.FINAL. NOTE: PROCEDURE PRINT used (Total process time):       real time           0.00 seconds       cpu time            0.00 seconds Can anyone provide some solutions? Thans! ... View more