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From |
meenakshi beri <berimeenakshi@hotmail.com> |

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

Subject |
RE: st: Re: st: RE: Ratio of coefficients from two regressions and standard error. |

Date |
Sat, 3 Dec 2011 21:35:03 +0000 |

Thanks a lot, Steve. Your code helped a lot! Best Regards,Meenakshi ________________________________ Meenakshi Beri Graduate Teaching Assistant Department of Economics Wayne State University dy5651@wayne.edu ---------------------------------------- > Subject: st: Re: st: RE: Ratio of coefficients from two regressions and standard error. > From: sjsamuels@gmail.com > Date: Sat, 3 Dec 2011 16:23:19 -0500 > To: statalist@hsphsun2.harvard.edu > > > > Bootstrapping the ratio should give good results with fewer assumptions about the regression coefficients. > > Steve > *************CODE BEGINS************* > sysuse auto, clear > capture program drop myboot > > program myboot, rclass > reg trunk length > scalar define b1 = _b[length] > > reg weight length > scalar define b2 = _b[length] > > return scalar ratio = b2/b1 > end > > bootstrap ratio =r(ratio) , reps(40): myboot > estat bootstrap, all > **************CODE ENDS************** > > On Dec 2, 2011, at 10:44 AM, meenakshi beri wrote: > > Thanks for your reply. One more question -- how to use Fieller's theorem and derive confidence limits using stata in this case? > > Meenakshi Beri > Graduate Teaching Assistant > Department of Economics > Wayne State University > dy5651@wayne.edu > > > From: Paul.Silcocks@liverpool.ac.uk > To: statalist@hsphsun2.harvard.edu > Subject: st: RE: Ratio of coefficients from two regressions and standard error. > Date: Fri, 2 Dec 2011 09:23:04 +0000 > > On the assumption that the two regression coefficient estimates have a Normal distribution, their ratio would have a Cauchy distribution (with no defined variance) if their correlation is zero. If the correlation is non-zero the exact distribution is complicated, though under certain conditions it tends to a Normal distribution. > > You'd be better off instead using Fieller's theorem to obtain confidence limits rather than estimating the standard error > > Paul Silcocks BM BCh, MSc , FRCPath, FFPH, CStat > Senior statistician, > Cancer Research UK Liverpool Cancer Trials Unit > University of Liverpool > Block C Waterhouse Building > 1-3 Brownlow Street > L69 3GL > > email: paul.silcocks@liverpool.ac.uk > tel: 0151 7948802 > mob: 0794 983 2775 > > -----Original Message----- > From: owner-statalist@hsphsun2.harvard.edu [mailto:owner-statalist@hsphsun2.harvard.edu] On Behalf Of meenakshi beri > Sent: 02 December 2011 06:08 > To: statalist@hsphsun2.harvard.edu > Subject: st: Ratio of coefficients from two regressions and standard error. > > Hello Statalist, > I am running a fixed effects regression followed by an auxiliary regression to capture the coefficient of time invariant variables. I want to estimate the ratio of two coefficients from these two regressions respectively along with the standard error of the ratio. How can I estimate the ratio and standard error? > Thanks,Meenakshi BeriWayne State University > * > * 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/ > > * > * 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/ * * 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: Ratio of coefficients from two regressions and standard error.***From:*meenakshi beri <berimeenakshi@hotmail.com>

**st: RE: Ratio of coefficients from two regressions and standard error.***From:*"Silcocks, Paul" <Paul.Silcocks@liverpool.ac.uk>

**RE: st: RE: Ratio of coefficients from two regressions and standard error.***From:*meenakshi beri <berimeenakshi@hotmail.com>

**st: Re: st: RE: Ratio of coefficients from two regressions and standard error.***From:*Steve Samuels <sjsamuels@gmail.com>

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