Stata Textbook Examples
Econometric Analysis of Cross Section and Panel Data by Jeffrey M. Wooldridge
Chapter 17: Sample Selection, Attrition, and Stratified Sampling

http://www.ats.ucla.edu/stat/Stata/examples/eacspd/chapter17.htm

REGOPROB: Stata module to estimate random effects generalized ordered probit models

regoprob is a user-written procedure to estimate random effects generalized ordered probit models in Stata. The actual values taken on by the dependent variable are irrelevant except that larger values are assumed to correspond to "higher" outcomes. The generalized model relaxes the parallel regression assumption of standard ordered probit models and its random effects counterpart. It is a rewritten version of goprobit for panel data. The likelihood for each unit is approximated by Gauss-Hermite quadrature.

http://fmwww.bc.edu/repec/bocode/g/goprobit_ll.ado

[此贴子已经被作者于2006-5-9 9:02:17编辑过]

For sure Stata will give you more options than SPSS and there is a huge community that is working with Stata, with similar problems to solve as you. In the reference manual set you will find a specific book that explain the panel data commands, take a look it at http://www.stata.com/bookstore/xt.html. Many econometrics textbook include Stata examples, but you can use the web for a introduction to the topic:

http://dss.princeton.edu/online_help/analysis/panel.htm,

http://www.ats.ucla.edu/stat/stata/stat130/longitud.htm or

http://www.ats.ucla.edu/stat/stata/library/3uk_paneldata.htm.

Rodrigo.

[此贴子已经被作者于2006-5-9 9:01:28编辑过]

[此贴子已经被作者于2006-5-9 8:59:56编辑过]