* MatrixSpring Example -- source code file spring-matrix.sas;

options linesize=70 nodate;
data spring;
   input disp force @@;
   label disp=Displacement
         force=Force;
   datalines;
0 0  1 49  2 101  3 149  4 201
;

proc print;

* Model 1: Regression through the origin
  Show means, USS, Variances, and SDs;
proc reg simple corr data=spring;

  * Show confidence limits for regression parameter 
    estimates, X-transpose X and its inverse,
    residuals, and predicted values;
  model force = disp / noint xpx i r p clm cli;

* Mode1 2: Regression through the origin
  Show means, USS, Variances, and SDs;
proc reg simple corr data=spring;

  * Show confidence limits for regression parameter 
    estimates, X-transpose X and its inverse,
    residuals, and predicted values;
  model force = disp /  xpx i r p clm cli;

run;
quit;