On Mon, 17 Nov 2003, Marcos Sanches wrote: > Ok, it worked!!! > > But what would be the command if I want to eliminate another point? I > mean, two points at the same time.
subset=-c(18,27) > > Thanks, > > Marcos > > -----Original Message----- > From: Prof Brian Ripley [mailto:[EMAIL PROTECTED] > Sent: Monday, November 17, 2003 1:02 PM > To: Marcos Sanches > Cc: R-Help > Subject: Re: [R] Generalized linear model > > > The second fit appeared to use a dataframe and the first did not. Try > > fit2<-glm(canc~id1+year1+time+lnpa,family=poisson, subset=-18) > > On Mon, 17 Nov 2003, Marcos Sanches wrote: > > > > > Hi all! > > > > I am fitting a Poisson model, using the following command: > > > > > fit2<-glm(canc~id1+year1+time+lnpa,family=poisson) > > > > > > > > where 'id1', 'year1' and 'time' are factors. I defined them with: > > > > > id1<-C(factor(id1), treatment) > > > > and 'lnpa' is a continuous variable. > > > > The 'summary' function gives me all the effects estimates, that is, for > id1, > > I end up with estimates for id12, id13 and id14, the id11 is the reference > > level. That is fine, but when I try to fit the model without the point 18, > > using the command line: > > > > > fit2<-glm(canc~id1+year1+time+lnpa,family=poisson, subset(dat, > order!=18)) > > > > The 'summary' function stop to giving me the levels effect, and gives only > > one effect for id1, one for year1, one for time and one for lnpa. I want > to > > have the parameters estimates for each level of each factor, as it was in > > the first fit. Also, I noticed the degree of freedom of deviance and the > > deviance itself has increased, so I cont't compare both models in terms of > > their deviance. > > > > What should I do to have each factor level effect as I had in the first > > case? > > > > Thanks > > > > Marcos > > > > ______________________________________________ > > [EMAIL PROTECTED] mailing list > > https://www.stat.math.ethz.ch/mailman/listinfo/r-help > > > > > > -- > Brian D. Ripley, [EMAIL PROTECTED] > Professor of Applied Statistics, http://www.stats.ox.ac.uk/~ripley/ > University of Oxford, Tel: +44 1865 272861 (self) > 1 South Parks Road, +44 1865 272866 (PA) > Oxford OX1 3TG, UK Fax: +44 1865 272595 > > ______________________________________________ > [EMAIL PROTECTED] mailing list > https://www.stat.math.ethz.ch/mailman/listinfo/r-help > > -- Brian D. Ripley, [EMAIL PROTECTED] Professor of Applied Statistics, http://www.stats.ox.ac.uk/~ripley/ University of Oxford, Tel: +44 1865 272861 (self) 1 South Parks Road, +44 1865 272866 (PA) Oxford OX1 3TG, UK Fax: +44 1865 272595 ______________________________________________ [EMAIL PROTECTED] mailing list https://www.stat.math.ethz.ch/mailman/listinfo/r-help
