DATA bodyfat1;
    INPUT x1 x2 x3 y;
    DATALINES;
  19.5  43.1  29.1  11.9
  24.7  49.8  28.2  22.8
  30.7  51.9  37.0  18.7
  29.8  54.3  31.1  20.1
  19.1  42.2  30.9  12.9
  25.6  53.9  23.7  21.7
  31.4  58.5  27.6  27.1
  27.9  52.1  30.6  25.4
  22.1  49.9  23.2  21.3
  25.5  53.5  24.8  19.3
  31.1  56.6  30.0  25.4
  30.4  56.7  28.3  27.2
  18.7  46.5  23.0  11.7
  19.7  44.2  28.6  17.8
  14.6  42.7  21.3  12.8
  29.5  54.4  30.1  23.9
  27.7  55.3  25.7  22.6
  30.2  58.6  24.6  25.4
  22.7  48.2  27.1  14.8
  25.2  51.0  27.5  21.1
;

PROC REG DATA=bodyfat1;
    MODEL y=x1 x2 x3;
    RUN;

QUIT;
*****************************************************************************
                               The SAS System                               1
                                           13:32 Thursday, September 28, 2017

                              The REG Procedure
                                Model: MODEL1
                           Dependent Variable: y

                   Number of Observations Read          20
                   Number of Observations Used          20


                            Analysis of Variance

                                    Sum of          Mean
  Source                  DF       Squares        Square   F Value   Pr > F

  Model                    3     396.98461     132.32820     21.52   <.0001
  Error                   16      98.40489       6.15031
  Corrected Total         19     495.38950


            Root MSE              2.47998    R-Square     0.8014
            Dependent Mean       20.19500    Adj R-Sq     0.7641
            Coeff Var            12.28017


                            Parameter Estimates

                         Parameter       Standard
    Variable     DF       Estimate          Error    t Value    Pr > |t|

    Intercept     1      117.08469       99.78240       1.17      0.2578
    x1            1        4.33409        3.01551       1.44      0.1699
    x2            1       -2.85685        2.58202      -1.11      0.2849
    x3            1       -2.18606        1.59550      -1.37      0.1896