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From |
Maarten buis <maartenbuis@yahoo.co.uk> |

To |
statalist@hsphsun2.harvard.edu |

Subject |
Re: st: Decile regression using sqreg |

Date |
Fri, 25 Apr 2008 16:29:36 +0100 (BST) |

--- Leonor Saravia <lmisaravia@gmail.com> wrote: > I understood that I'm having a problem with the interpretation of > the coefficients, because I can't understand what's the meaning of > each one of the coefficients obtained with this command. > > I'm working with some households surveys for latinamerican countries, > so the data I'm using has the next variables: > > household_identifier income food_expenditure > 123 1000 800 > 445 2980 1500 > 670 500 250 > . . . > . . . > . . . > 870 15200 14000 > > > The model that I'd like to perform is this: > > income = a + b*(food_expenditure) + error > > And I need to compare the coefficients for each decil of income of > the population of each country, something like comparing the > coefficient for the food expenditure done by 10% of the poorest > population and the richest 10% of the population. > > I think that the quantile regression is the way to do this, using the > "sqreg" command, am I wrong? > > That's why I thought that I need 10 regressions instead of 9, because > I need to compare the coefficients for each one of the 10th parts of > the population. In your model you are thinking that food expenditure causes income, I would say that it is the other way round. Anyhow, you are probably looking for something like this: *-------- begin example ------------ sysuse nlsw88, clear drop if missing(grade) egen decile = cut(wage), group(10) tabstat grade, by(decile) s(mean) *--------- end example ------------- (For more on how to use examples I sent to the Statalist, see http://home.fsw.vu.nl/m.buis/stata/exampleFAQ.html ) Here you see the mean grade (in your case food expenditure) for the 10% poorest (coded 0), between 10-20% poorest (coded 1), etc. Hope this helps, Maarten ----------------------------------------- Maarten L. Buis Department of Social Research Methodology Vrije Universiteit Amsterdam Boelelaan 1081 1081 HV Amsterdam The Netherlands visiting address: Buitenveldertselaan 3 (Metropolitan), room Z434 +31 20 5986715 http://home.fsw.vu.nl/m.buis/ ----------------------------------------- ___________________________________________________________ Yahoo! For Good. Give and get cool things for free, reduce waste and help our planet. Plus find hidden Yahoo! treasure http://green.yahoo.com/uk/earth-day/ * * 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**:**Re: st: Decile regression using sqreg***From:*"Leonor Saravia" <lmisaravia@gmail.com>

**References**:**Re: st: Decile regression using sqreg***From:*"Leonor Saravia" <lmisaravia@gmail.com>

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