Next week would be fine.
Joe Newton and Nick Cox
[email protected]
Editors, Stata Journal
Stas Kolenikov
> extra two cents: many latent variable structural equation models are
> estimable by instrumental variable methods. Unlike in economics, where
> the instruments are usually pulled out of thin air, one can derive the
> rigorous ways to pick model-implied instruments. IV methods are less
> efficient that MLE (although I have not seen efficiency losses greater
> than 30% in those applications), but they are more robust to model
> misspecification. Moreover, one can test certain misspecifications
> such as omitted paths or measurement error correlations with Hausman
> test on instruments. Ken Bollen has been the main contributor to this
> topic (Bollen, KA (1996) 'An Alternative Two Stage Least Squares
> (2SLS) Estimator for Latent Variable Equations.' Psychometrika, 61:
> 109-121; Bollen, K A, and Bauer, D J (2004), Automating the Selection
> of Model-Implied Instrumental Variables, Soc. Methods & Research, 32
> (4), 425-452). Being his student, someday I should write a paper to
> Stata Journal on how to do all that by -ivreg-...
*
* 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/
