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From |
"Clive Nicholas" <Clive.Nicholas@newcastle.ac.uk> |

To |
statalist@hsphsun2.harvard.edu |

Subject |
Re: st: Interpting Dichotomous |

Date |
Mon, 23 Aug 2004 03:09:24 +0100 (BST) |

Syed O. Masood wrote: > In regression analysis, how do we interpret dichotomus > variables. I have given the result from analysis [...] > ------------------------------------------------------------------------------ > mfm1 | Coef. Std. Err. t P>|t| > [95% Conf. Interval] > -------------+---------------------------------------------------------------- > gender | -1.674738 .7244781 -2.31 0.023 > -3.117358 -.2321178 > _cons | 9.453125 .4538293 20.83 0.000 > 8.549435 10.35681 > ------------------------------------------------------------------------------ > > dependent variable is resting flow and independet is > gender which accouts for 6% of varibality in blod flow > (mfm1). Coefficient is -1.6 and slope is 9.45. How > would I know if it is male or female which accounts > for decrease in blood flow. In addition to what Renzo has told you about coding (which I fully support), interpreting the coefficient depends on how the gender dummy variable is coded. If we assume (as Renzo has assumed) that your gender variable codes are male = 0 and female = 1, then for a 1-unit change in gender (i.e., for females in your sample), blood flow decreases by -1.67 units. The t- and p-values indicate that the coefficient is statistically significant from zero. Why do we know this? Look at the confidence intervals: the upper and lower bounds of the CI do not contain 0. When they do, the coefficient is never significant. (If the dependent variable was itself dichotomous - and thus, you were running a logisitic regression - that 0 would be 1.) The constant term reports the baseline value of the dependent variable when all of the model's explanatory variables are set to 0. From your output, the baseline value of blood flow = 9.45. Using the information contained in your model, then, we can work out that the estimated mean blood flow for males = (9.45 + 0) = 9.45 units. For females = (9.45 - 1.67) = 7.78 units. CLIVE NICHOLAS |t: 0(044)191 222 5969 Politics |e: clive.nicholas@ncl.ac.uk Newcastle University |http://www.ncl.ac.uk/geps * * 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: Interpting Dichotomous***From:*Syed O Masood <syedmasood2@yahoo.com>

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