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From |
"Shehzad Ali" <sia500@york.ac.uk> |

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

Subject |
st: demographic standardization after treatreg |

Date |
Fri, 11 Jul 2008 12:36:22 +0100 |

Hi listers, I have a query related to demographic standardisation after treatreg model. I want to standardise my dependent variable y on demographic variables age and sex. One of the explanatory variables, x1, is a binary endogenous variables, therefore I am using a treatreg model instead of using simple OLS. I am following the methodology suggested by O'Donnell et al (2008) in their book 'Analyzing Health Equity using Household Survey Data", though they only used an OLS model for standardisation. Here is how I am proceeding: 1. Run the following model: treatreg y x1 x2 age sex, treat(x1= x2 age sex instrument_1) 2. Get coefficients and then predict yhat by using mean_age and mean_sex instead of actual age and sex 3. Subtract: yi - yhat + y_mean My question is: Does the above prediction take into account the Inverse Mills Ratio (IMR) from stage 1 or should I run a separate -regress- with the IMR as an additional regressor to get the prediction? Thank you, Shehzad * * 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/

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