* SpringReg Example -- springreg.sas source code;

options linesize=70 nodate;
data spring;
   input disp force;
   title "Illustration of Hooke's Law";
   label disp="Displacement of Spring"
         force="Counterforce of Spring";
   datalines;
0   0
1  49
2 101
3 149
4 201
;

proc print;

proc means;

symbol1 value=dot color=black;
proc reg corr data=spring; 

   * Model 1: Regression through the origin;
   model force = disp / noint; 
   plot force*disp;

   * Model 2: Simple linear regression;
   model force = disp; 
   plot force*disp;

run;
quit;