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From |
Martin Weiss <martin.weiss@uni-tuebingen.de> |

To |
statalist@hsphsun2.harvard.edu |

Subject |
Re: st: a question on t-test |

Date |
Fri, 20 Jun 2008 23:42:58 +0200 |

You might want to look into -anova-, with -oneway- as a simpler entry point, if you have several comparisons to conduct..

Zitat von Lili Yan <lyan16@gmail.com>:

Hi Richard, Thank you very much for your prompt response! I did not use -ttest- for several reasons: First, I actually have a weight variale in my data and -ttest- does not allow weights. Second, I need compare means of many variables, so I want to quietly run means calculation and comparison, then generate a table with -mat- commands. In that table, I want to see p-value. So I have to calculate it as Stata does not save it. To me, the -lincom- seems to do what I want, but I want to confirm this with people better in statistics and more familiar with Stata than me. Please let me know if what I did is correct. Thanks a lot! Best, Lili On Fri, Jun 20, 2008 at 4:24 PM, Richard Williams <Richard.A.Williams.5@nd.edu> wrote:I'm probably missing something, but wouldn't it be a lot more straightforward just to use the ttest command, e.g. ttest mpg, by(foreign) At 04:57 PM 6/20/2008, Lili Yan wrote:Hi there, I need calculate the mean of two groups (say, native cars and foreign cars) and do a t-test. However, I am not very sure if -lincom- is the correct command after -mean-. Could anyone please let me know if the following commands are right? mean mpg, over(foreign) lincom [`var']0-[`var']1 di 2*ttail(r(df), abs(r(estimate)/r(se))) Thanks in advance! Best, Lili * * For searches and help try: * http://www.stata.com/support/faqs/res/findit.html * http://www.stata.com/support/statalist/faq * http://www.ats.ucla.edu/stat/stata/------------------------------------------- Richard Williams, Notre Dame Dept of Sociology OFFICE: (574)631-6668, (574)631-6463 HOME: (574)289-5227 EMAIL: Richard.A.Williams.5@ND.Edu WWW: http://www.nd.edu/~rwilliam * * For searches and help try: * http://www.stata.com/support/faqs/res/findit.html * http://www.stata.com/support/statalist/faq * http://www.ats.ucla.edu/stat/stata/* * For searches and help try: * http://www.stata.com/support/faqs/res/findit.html * http://www.stata.com/support/statalist/faq * http://www.ats.ucla.edu/stat/stata/

* * For searches and help try: * http://www.stata.com/support/faqs/res/findit.html * http://www.stata.com/support/statalist/faq * http://www.ats.ucla.edu/stat/stata/

**References**:**st: a question on t-test***From:*"Lili Yan" <lyan16@gmail.com>

**Re: st: a question on t-test***From:*Richard Williams <Richard.A.Williams.5@ND.edu>

**Re: st: a question on t-test***From:*"Lili Yan" <lyan16@gmail.com>

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