[Date Prev][Date Next][Thread Prev][Thread Next][Date index][Thread index]

From |
"vtnanh@yahoo.com" <vtnanh@yahoo.com> |

To |
Statalist <statalist@hsphsun2.harvard.edu> |

Subject |
st: missing p-value from t-test |

Date |
Fri, 23 May 2008 07:31:11 -0700 |

Dear stata-users, My appologies for a beginner’s question. I’m estimating the following model using OLS: lnROA=alpha + beta(1)*lnW(1) + beta(2)*lnW(2) + beta(3)*lnW(3) + gamma*D + epsilon. Then I calculate an E statistic that equals the sum of beta(1), beta(2), and beta(3). I want to test whether E=0, using a t-test: ttest E==0 One-sample t test ------------------------------------------------------------------------------ Variable | Obs Mean Std. Err. Std. Dev. [95% Conf. Interval] ---------+-------------------------------------------------------------------- E_CZE_B | 38 -.0550183 0 0 -.0550183 -.0550183 ------------------------------------------------------------------------------ mean = mean(E_CZE_B) t = . Ho: mean = 0 degrees of freedom = 37 Ha: mean < 0 Ha: mean != 0 Ha: mean > 0 Pr(T < t) = . Pr(|T| > |t|) = . Pr(T > t) = . I would like to know why all the p-values are missing here? Is it because E is a fixed value for all observations? If this is the case, how can I test this hypothesis, i.e. E=0? Any help would be very much appreciated. Anh * * 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/ Privileged, confidential or patient identifiable information may be contained in this message. This information is meant only for the use of the intended recipients. If you are not the intended recipient, or if the message has been addressed to you in error, do not read, disclose, reproduce, distribute, disseminate or otherwise use this transmission. Instead, please notify the sender by reply e-mail, and then destroy all copies of the message and any attachments. * * 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/

**Follow-Ups**:**st: RE: missing p-value from t-test***From:*"Newson, Roger B" <r.newson@imperial.ac.uk>

- Prev by Date:
**Re: st: Bivariate Probit** - Next by Date:
**RE: st: Beware of Stata's Syntax** - Previous by thread:
**st: RE: missing p-value from t-test** - Next by thread:
**st: RE: missing p-value from t-test** - Index(es):

© Copyright 1996–2023 StataCorp LLC | Terms of use | Privacy | Contact us | What's new | Site index |