/************************ math0.1.sas *************************/
title 'Prediction of Performance in First-year Calculus';
title2 'Read exploratory data and locate problems: Part 1';

data mathex;
     infile '/home/brunner0/441s20/exploremath.data.txt';
     input id course precalc calc gpa calculus english mark lang $ sex $ 
           nation1 nation2 sample;

proc freq data=mathex;
     title3 'Frequency distributions of all variables'; /* Don't print this! */
     tables _all_;

/* After looking at frequency distributions, locate problem cases if necessary */

proc print data=mathex;
      title3 'Strange marks in HS English';
      where english=0 or english > 100;

proc print data=mathex;
      title3 'Students with Strange High School Marks';
      where gpa = 0 or 
            english=0 or english > 100  or
            calculus=0 or calculus>100;