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| From | "Whelan, Paul" <Paul.Whelan@bankofengland.co.uk> |
| To | "'statalist@hsphsun2.harvard.edu'" <statalist@hsphsun2.harvard.edu> |
| Subject | RE: st: Panel Regression with missing x for one entity |
| Date | Thu, 16 Aug 2012 15:23:21 +0100 |
Hi, Does anyone have some advice re: the below? All countries were included in the estimation, just that at the prediction stage in there happens to be missing data on the right hand side then stata gives me no forecast? Thanks, Paul -----Original Message----- From: owner-statalist@hsphsun2.harvard.edu [mailto:owner-statalist@hsphsun2.harvard.edu] On Behalf Of Whelan, Paul Sent: Wednesday, August 15, 2012 3:08 PM To: 'statalist@hsphsun2.harvard.edu' Subject: RE: st: Panel Regression with missing x for one entity Well, The is no information for this particular conditioning variable contributing to the forecast for this country but it did contribute to the fit for the other countries. So, a forecaster should still be able to make a projection. It's like y_1 = c_1 + beta_11 X_1 + beta_12 X_2 + eps_1 y_2 = c_2 + beta_12 X_1 + + eps_2 stata doesn't compute E[y_2(t+h) | X_1] if [c_2 , beta_12 ] is estimated from the panel -----Original Message----- From: owner-statalist@hsphsun2.harvard.edu [mailto:owner-statalist@hsphsun2.harvard.edu] On Behalf Of Nick Cox Sent: Wednesday, August 15, 2012 11:10 AM To: statalist@hsphsun2.harvard.edu Subject: Re: st: Panel Regression with missing x for one entity ************************* This email has reached the Bank via the Internet or an external network ************************* It's often difficult to know what is obvious, but let's spell out that if any values were missing for a particular country, then no data for that country contributed to the model fit. Nick On Wed, Aug 15, 2012 at 10:55 AM, Whelan, Paul <Paul.Whelan@bankofengland.co.uk> wrote: > Sure - I guess that is obvious. > > Thanks, > Paul > > -----Original Message----- > From: owner-statalist@hsphsun2.harvard.edu [mailto:owner-statalist@hsphsun2.harvard.edu] On Behalf Of Maarten Buis > Sent: Tuesday, August 14, 2012 7:23 PM > To: statalist@hsphsun2.harvard.edu > Subject: Re: st: Panel Regression with missing x for one entity > > On Tue, Aug 14, 2012 at 7:43 PM, Whelan, Paul wrote: >>> I'm running a panel regression with a cross-section of countries: >> >> y_it = c_it + beta_1 x_1 + ... + beta_n x_n + eps_it >> >> For one of my countries , a particular x is completely missing. >> The estimation works fine but I cannot produce predictions for this particular entity. > > You (through Stata) create the prediction by just filling in the > equation you gave above. A missing value just mean you don't know the > value. What would be the outcome of: beta_1*"an unknown value"? Stata > correctly answers: "an unknown value". > * * 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/ _____________________________________________________________________ This e-mail originated from the Internet and has been scanned for known viruses by the Messagelabs SkyScan Service. *********************************************************************************** This e-mail is intended for the addressee(s) named above and any other use is prohibited. It may contain confidential information. If you received this e-mail in error please contact the sender by return e-mail. The Bank of England does not accept legal responsibility for the contents of this message if it has reached you via the Internet, as Internet communications are not secure. Any opinions expressed are those of the author and are not necessarily endorsed by the Bank of England. Recipients are advised to apply their own virus checks to this message . *********************************************************************************** _____________________________________________________________________ This e-mail has been scanned for known viruses by the Messagelabs SkyScan Service. * * 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/ _____________________________________________________________________ This e-mail originated from the Internet and has been scanned for known viruses by the Messagelabs SkyScan Service. _____________________________________________________________________ This e-mail has been scanned for known viruses by the Messagelabs SkyScan Service. * * 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/