OPTIONS LS=70;
DATA A;
INFILE 'Z:\bibd.dat';
INPUT DAY CHEMICAL $ COUNT;
PROC GLM;
CLASS DAY CHEMICAL;
MODEL COUNT=DAY CHEMICAL;
LSMEANS CHEMICAL/STDERR PDIFF;
OUTPUT OUT=OUTA P=YHAT R=RESID;
PROC PLOT;
PLOT RESID*YHAT;
RUN;