The data set SCORE contains test scores for college students who took two tests and a final exam. ScoreChange contains the difference in the score between the first test and the second test. 
data score;
   input Student $ Test1 Test2 Final @@;
   ScoreChange=test2-test1;
   datalines;
Capalleti  94 91 87  Dubose     51 65 91
Engles     95 97 97  Grant      63 75 80
Krupski    80 75 71  Lundsford  92 55 86
Mcbane     75 78 72  Mullen     89 82 93
Nguyen     79 76 80  Patel      71 77 83
Si         75 70 73  Tanaka     87 73 76
;