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From |
"Martin Weiss" <martin.weiss1@gmx.de> |

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

Subject |
st: RE: plotting coefficients after quantile regression- beyond grqreg |

Date |
Sun, 7 Mar 2010 19:10:23 +0100 |

<> The difficulty here is that -qreg- does not seem to like -fvvarlist-s, which in other cases make quadratic vars much easier to specify (It does not allow -coeflegend-, either...). So you want to check this very, very carefully whether it does what you want: ******* sysuse auto, clear gen mpgsq=mpg^2 egen lengthmean=mean(length) egen turnmean=mean(turn) foreach quant of numlist 10 25 50 75 90{ qreg price mpg mpgsq length turn, q(`quant') gen pred`quant'=_b[_cons]+_b[mpg]*mpg+_b[mpgsq]*mpgsq+ /* */ _b[length]*lengthmean+_b[turn]*turnmean la var pred`quant' "Quantile `quant'" } sort mpg tw (line pred10 mpg) /* */ (line pred25 mpg) (line pred50 mpg) /* */ (line pred75 mpg) (line pred90 mpg) ******* HTH Martin -----Original Message----- From: owner-statalist@hsphsun2.harvard.edu [mailto:owner-statalist@hsphsun2.harvard.edu] On Behalf Of Prabhat Sent: Sonntag, 7. März 2010 15:04 To: statalist@hsphsun2.harvard.edu Subject: st: plotting coefficients after quantile regression- beyond grqreg Dear all, I need your help regarding plots for quantile regression results. I am new to STATA as well as quantile regression both. I am running a quantile regression with independent variable X and its square term i.e. X^2. there are a number of other variables. however, my requirement is to show the parabolic curve i.e. dependent variable vs X for quantile= 0.1,0.25, 0.5, 0.75, 0.9, keeping all other explanatory variables at their average value. So, it will be kind of a 5 parabolic curves on a single plot. I know there is a very helpful command GRQREG, but it does not plot the particular estimated coefficients for a number of quantiles on the same plot. Kindly correct me, if there is any way here. Further, the only other option I can think of if to do it manually after getting the results. But, that seems to be a difficult and tedious task because i have to repeat it for a number of cycles. Any suggestion will be highly appreciated. Thank you. Regards. Prabhat Barnwal International University of Japan * * For searches and help try: * http://www.stata.com/help.cgi?search * http://www.stata.com/support/statalist/faq * http://www.ats.ucla.edu/stat/stata/ * * For searches and help try: * http://www.stata.com/help.cgi?search * http://www.stata.com/support/statalist/faq * http://www.ats.ucla.edu/stat/stata/

**References**:**st: plotting coefficients after quantile regression- beyond grqreg***From:*Prabhat <prabhat@iuj.ac.jp>

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