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From |
Even Bergseng <even.bergseng@umb.no> |

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

Subject |
RE: st: mfx - conditional and unconditional elasticities |

Date |
Thu, 20 Dec 2007 19:16:19 +0100 |

Thanks, Austin. That's valuable input. I'll keep away from selecting at Y's then. But my interpretation of the -mfx- options is correct? regards, Even >-----Original Message----- >From: owner-statalist@hsphsun2.harvard.edu [mailto:owner- >statalist@hsphsun2.harvard.edu] On Behalf Of Austin Nichols >Sent: Thursday, December 20, 2007 4:41 PM >To: statalist@hsphsun2.harvard.edu >Subject: Re: st: mfx - conditional and unconditional elasticities > >Even Bergseng <even.bergseng@umb.no>: >I think not. Predicting at some X=x is a way of >characterizing/interpreting the model's estimated coefficients; >selecting on the explanatory variables X in creating a subsample to >predict over (or to compute means of X at which to predict) is >unproblematic, and relatively easy to interpret for a simple selection >rule, e.g. X=(female, college). Selecting on y seems like a bad idea >for all kinds of reasons. > >On Dec 20, 2007 10:31 AM, Even Bergseng <even.bergseng@umb.no> wrote: >> I want to use -mfx- to compute elasiticities after -tobit/xttobit-. My >interpretation is that the commands >> >> . mfx compute, eyex predict(ystar(0,.)) >> . mfx compute, eyex predict(e(0,.)) >> >> should produce respectively unconditional (all observations) and >conditional (non-limit observations) elasticities. Am I correct? >> >> If so: Both elasticities are interpreted at the mean of all >observations. Would it be logical to use mean values for the non-limit >sample to produce the conditional elasticities? (i.e. add the option >at(avg) to mfx where avg is means for the non-limit sample). >> >* >* 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/ * * 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: Basic question on interpreting Durbin alternative test for autocorrelation***From:*"Josiane Georges" <jgeorges@health.nyc.gov>

**Re: st: Basic question on interpreting Durbin alternative testfor autocorrelation***From:*Robert A Yaffee <bob.yaffee@nyu.edu>

**RE: st: Basic question on interpreting Durbin alternative testfor autocorrelation***From:*"Josiane Georges" <jgeorges@health.nyc.gov>

**st: mfx - conditional and unconditional elasticities***From:*Even Bergseng <even.bergseng@umb.no>

**Re: st: mfx - conditional and unconditional elasticities***From:*"Austin Nichols" <austinnichols@gmail.com>

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