options ps=54 ls=76; FILENAME website HTTP "http://www.stat.ufl.edu/~winner/data/swamp1.dat"; data swamp; infile website; input size swampid watlev; run; proc means mean; class size; var watlev; run; proc means mean std; class swampid; var watlev; run; proc glm; class size swampid; model watlev = size swampid(size); test h=size e=swampid(size); run; quit;