Ronaldo Reis Jr. wrote:
> I know that is not possible make a stepwise procedure using REML in R, I
can
> use ML for this.
> For nested design it may be very dangerous due the difference in variance
> structure, mainly in a splitplot design. ML make significative variables
that
> REML dont make.
> I read an article that is made a stepwise procedure using GENSTAT.
> All are made using REML.
One can always compare models in a hierarchical type fashion (providing
they can be nested). The LRTS comparing models fitted via
REML may not be chi-square.
--
| David Duffy (MBBS PhD) ,-_|\
| email: davidD at qimr.edu.au ph: INT+61+7+3362-0217 fax: -0101 / *
| Epidemiology Unit, Queensland Institute of Medical Research \_,-._/
| 300 Herston Rd, Brisbane, Queensland 4029, Australia GPG 4D0B994A v