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From |
Ronan Conroy <rconroy@rcsi.ie> |

To |
statalist@hsphsun2.harvard.edu |

Subject |
Re: st: Table for difference in means test |

Date |
Sun, 22 Jul 2007 18:34:00 +0100 |

On 22 Jul 2007, at 00:35, Hugh Colaco wrote:

You might think of displaying the actual difference between the means and its confidence interval, which helps the reader by doing the subtraction sum for him/her and also giving a margin of uncertainty about the result, neither of which your proposed format does.I am doing a difference in means test and am having problems displaying a table. My variables names are q52-q61. I have a categorical variable q2q6 which takes the value 1 or 2. I need the table in the following format, based on the categorical variable. N = no of obs. Variable N1 Mean1 N2 Mean2 p-value

Note that this is an easy matter using -regress-,

. sysuse auto

(1978 Automobile Data)

. regress mpg foreign

[snip]

------------------------------------------------------------------------ ------

mpg | Coef. Std. Err. t P>|t| [95% Conf. Interval]

------------- +----------------------------------------------------------------

foreign | 4.945804 1.362162 3.63 0.001 2.230384 7.661225

_cons | 19.82692 .7427186 26.70 0.000 18.34634 21.30751

------------------------------------------------------------------------ ------

The coefficient for foreign is the difference between the means. (If you want the equivalent of a t-test for unequal variances, specify - robust-).

This doesn't solve the problem of giving N1 and N2, but otherwise I think it's a more useful line of output.

P Before printing, think about the environment

=================================

Ronan Conroy

rconroy@rcsi.ie

Royal College of Surgeons in Ireland

120 St Stephen's Green, Dublin 2, Ireland

+353 (0)1 402 2431

+353 (0)87 799 97 95

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**References**:**st: Table for difference in means test***From:*"Hugh Colaco" <hmjc66@gmail.com>

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