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From |
"Henrique Neder" <hdneder@ufu.br> |

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

Subject |
st: RES: Dummy |

Date |
Sun, 2 Dec 2007 17:49:22 -0200 |

Linda In some form you can use a dummy as a dependent variable in logistic model or in a probit model. These models are non linear and through them you can estimate the probability of a particular event. This event is relative a dichotomous variable (1 = success, 0 = failure). The logit model is of form: Ln(p/(1-p)) = beta0 + beta1*X1 + beta2*X2 + ... + betap*Xp + u where: p = probability of sucess beta0, beta1, ..., betap are parameters X1, X2, ...., Xp are covariates (independent variables). u is the error term p/(1-p) is the odd ratio and p = probability of X = 1. So you are modeling not X directly, but the probability of X assuming a determinate value. X is a dummy variable. The interpretation of the parameters (estimates) values are as follow: If the estimate of betap is betaphat so a variation of one unity in Xp "cause" a variation of 100*(exp(betaphat)-1) per cent in the odd ratio (p/(1-p)), fixing the others covariates. This is somehow different of the multiple regression estimates in a linear model. Henrique -----Mensagem original----- De: owner-statalist@hsphsun2.harvard.edu [mailto:owner-statalist@hsphsun2.harvard.edu] Em nome de Linda Walker Enviada em: sábado, 1 de dezembro de 2007 14:30 Para: statalist@hsphsun2.harvard.edu Assunto: st: Dummy Hello statalist Can dummy(ies) be used as dependent variable(s)? Please help. Many thanks Linda * * 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/ __________ Informação do NOD32 IMON 2694 (20071130) __________ Esta mensagem foi verificada pelo NOD32 sistema antivírus http://www.eset.com.br * * 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: Dummy***From:*Linda Walker <linda.walker4@googlemail.com>

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