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Reading a SAS Data File 
into PROC IML

options nocenter ;

data test ;
  input y x0 x1 x2 ;
cards;
7  1 2 1
15 1 4 4
20 1 3 7
15 1 6 3
12 1 5 2
8  1 1 2
;
run;

proc iml;
  * Read data into IML ;
  use test;
  read all ;

 * combine x0 x1 x2 into a matrix X ;
  x = x0 || x1 || x2;

  print x;

  * now get b ;
  b = INV(x`*x)*(x`*y) ;
  yp = x * b ;
  ye = y - yp ;

  print "predictor variables";
  print x;
  print "predicted variable";
  print y;

  print "parameter estimates";
  print b;

  print "predicted value of Y";
  print yp ;

  print "error in prediction of Y";
  print ye ;
 
  *writing out b as a data set;
  create c var {parameter} ;
  append from b;
  quit;
proc print data = c;
run;

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