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From |
Christopher F Baum <baum@bc.edu> |

To |
statalist@hsphsun2.harvard.edu |

Subject |
st: Re: one-tail test |

Date |
Mon, 11 Oct 2004 09:45:20 -0400 |

On Oct 11, 2004, at 2:33, Levy wrote:

Presuming that the test statistic is of the positive persuasion, divide the reported p-value in half. E.g.How can i perform a one sided test after a linear regression? after this regression regress y x1 x2 i want to test if the coefficient of x2 is greater than 0

headroom | -659.463 484.5101 -1.36 0.178 -1625.788 306.8619

This test would be insig. at 10% level or better as a two-tailed test, but

. di ttail(74,1.36)

.08897949

indicates that a t of this (absolute) magnitude would allow us to test that the coeff is negative with a significance level of 91+%, that is, signif. at ten percent level as a one-tailed test.

Kit Baum, Boston College Economics baum@bc.edu

http://ideas.repec.org/e/pba1.html

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