Page 134 - Applied Statistics with R
P. 134

134     CHAPTER 8. INFERENCE FOR SIMPLE LINEAR REGRESSION





                                         3.04

                                    Empirical Mean of  β 0  3.00  2.98
                                    ^    3.02










                                         2.96



                                             0        2000       4000      6000      8000      10000

                                                               Number of Simulations




                                 8.3 Standard Errors


                                 So now we believe the two distributional results,


                                                                            2
                                                                            ̄   
                                                        ̂
                                                                   2
                                                          ∼    (   ,    ( 1  +           ))
                                                                0
                                                        0
                                                                        
                                                                    2
                                                        ̂
                                                          ∼    (   ,             ) .
                                                        1
                                                                1
                                 Then by standardizing these results we find that
                                                             ̂
                                                               −    0  ∼   (0, 1)
                                                             0
                                                                 ̂
                                                            SD[   ]
                                                                0
                                 and
                                                             ̂
                                                               −    1  ∼   (0, 1)
                                                             1
                                                                 ̂
                                                            SD[   ]
                                                                1
                                 where
   129   130   131   132   133   134   135   136   137   138   139