Notice: On April 23, 2014, Statalist moved from an email list to a forum, based at statalist.org.
From | Lisa Marie Yarnell <lisayarnell@yahoo.com> |
To | statalist@hsphsun2.harvard.edu |
Subject | st: test or ftest command |
Date | Wed, 8 Jun 2011 10:28:58 -0700 (PDT) |
Hello Stata group! I am trying to do an ftest (or other test possibly using the "test" command) comparing two models: one regression model in which clustering of persons within schools is modeled, and one regression with clustering of persons within schools *not* modeled. I am concerned that these are not really nested models, however. Can I still use the test or ftest command? Is there another command that I should be using? Our basic question is: "Is it important to model the clustering of persons wihtin schools, based on comparisons of model fit?" Here are the models: (1) regress w3bmi_ms bio_sex w3_yrs w1faminc black hispanic mothed selfed sup_dens ffchdens nat_dens con_dens veg_dens act_dens med_hval, cluster (scid) (2) regress w3bmi_ms bio_sex w3_yrs w1faminc black hispanic mothed selfed sup_dens ffchdens nat_dens con_dens veg_dens act_dens med_hval Can I use the test command for this? When I tried, I got the error message below; Stata treated "cluster(scid)" as a variable in the model: regress w3bmi_ms bio_sex w3_yrs w1faminc black hispanic mothed selfed sup_dens ffchdens nat_dens con_dens veg_dens act_dens med_hval, cluster (scid) test cluster(scid) cluster not found THANKS! Lisa * * 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/