* CPUReg1 Example -- cpureg1.sas source code;

* Read input data;
options linesize=70 nodate;
data cputime;
   infile "c:/datasets/cpu.txt" firstobs=10;
   input cputime cardsin linesout steps devices;
   label cputime="CPU Time in Seconds"
         cardsin="Number of Punched Cards Input"
		 linesout="Number of Lines Output"
		 steps="Number of Programs Loaded"
		 devices="Number of Mounted Devices";
   
proc print;

* Set value and color of plot symbol;
symbol v=dot c=black h=0.75;

* Full model with all regressors;
proc reg;
   model cputime=cardsin linesout steps devices;

* Model with cardsin removed, stb option 
  prints standardized regression coefficients; 
proc reg;
   model cputime=linesout steps devices / stb;
   plot r.*p. r.*linesout r.*steps r.*devices r.*nqq.;

run;
quit;