OPTIONS LS=75 PS=60;

DATA a;

INFILE 'caffeine.dat' ;

INPUT Smoker Gender Subject Time Level ;

PROC SORT; By Time;

PROC MEANS; BY Time;

RUN ;


Title 'saliva vs plasma';

DATA b;

INFILE 'caffplas.dat' ;

INPUT Subject Time Saliva  Plasma ;

PROC SORT; By Time;

PROC MEANS; BY Time;

RUN ;