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| From | John Antonakis <John.Antonakis@unil.ch> |
| To | statalist@hsphsun2.harvard.edu |
| Subject | Re: st: sem - is it possible to drop error terms? |
| Date | Tue, 12 Mar 2013 21:05:41 +0100 |
If you show your syntax maybe someone could help you. Best, J. __________________________________________ John Antonakis Professor of Organizational Behavior Director, Ph.D. Program in Management Faculty of Business and Economics University of Lausanne Internef #618 CH-1015 Lausanne-Dorigny Switzerland Tel ++41 (0)21 692-3438 Fax ++41 (0)21 692-3305 http://www.hec.unil.ch/people/jantonakis Associate Editor The Leadership Quarterly __________________________________________ On 12.03.2013 20:17, Jacob Felson wrote:
Stas, Thanks! Its strange -- when I try to run a basic behavior genetic model (ACE) using Stata's sem command, I immediately receive an error saying there are too many latent variables and the model is not identified. But this model is definitely identified -- at least theoretically. Model is here: http://www.biomedcentral.com/1471-2202/5/49/figure/F1?highres=y Sorry to bother you. Any help you could provide is much appreciated. Sincerely, Jacob Felson On Tue, Mar 12, 2013 at 2:59 PM, Stas Kolenikov <skolenik@gmail.com> wrote:Jacob, you can constrain the variance of these error terms to zero with -variance()- option of -sem-. -- Stas Kolenikov, PhD, PStat (SSC) -- Senior Survey Statistician, Abt SRBI -- Opinions stated in this email are mine only, and do not reflect the position of my employer -- http://stas.kolenikov.name On Tue, Mar 12, 2013 at 1:53 PM, John Antonakis <John.Antonakis@unil.ch> wrote:Hi Jacob: You need to be much more specific about what specific model you wish to test (write-out equations or syntax). Most probably don't know what ACE is: http://www.stata.com/support/faqs/resources/statalist-faq/ Best, J. __________________________________________ John Antonakis Professor of Organizational Behavior Director, Ph.D. Program in Management Faculty of Business and Economics University of Lausanne Internef #618 CH-1015 Lausanne-Dorigny Switzerland Tel ++41 (0)21 692-3438 Fax ++41 (0)21 692-3305 http://www.hec.unil.ch/people/jantonakis Associate Editor The Leadership Quarterly __________________________________________ On 12.03.2013 19:30, Jacob Felson wrote:I'm wondering if its possible to drop the error terms that are included by default in sem models. I've searched in the manual and online but I can't find any indication that this is possible. I imagine its not, but I wanted to check with the experts to make sure. (I'm estimating a behavior genetic model with data on MZ and DZ twins -- the so-called ACE model.) Thank you, Jacob Felson * * For searches and help try: * http://www.stata.com/help.cgi?search * http://www.stata.com/support/faqs/resources/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/faqs/resources/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/faqs/resources/statalist-faq/ * http://www.ats.ucla.edu/stat/stata/-- Jacob Felson * * For searches and help try: * http://www.stata.com/help.cgi?search * http://www.stata.com/support/faqs/resources/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/faqs/resources/statalist-faq/ * http://www.ats.ucla.edu/stat/stata/