data sas;
infile cards missover;
input group $ @;
do i=1 to 6;
input add_weight @;
if add_weight =. then delete;
output;
end;
cards;
B1 21.5 19.5 20.0 22.0 18.0 20.0
B2 16.0 18.5 17.0 15.5 20.0 16.0
B3 19.0 17.5 20.0 18.0 17.0
B4 21.0 18.5 19.0
B5 15.5 18.0 17.0 16.0
;
proc glm;
class group;
model add_weight=group;
run;