This functions are different. I advice you study them: ?confint # profile likelihood ?confint.default # t-distribution
Walmes Zeviani - Brazil casperyc wrote: > > Hi, > > I have a glm gives summary as follows, > > Estimate Std. Error z value Pr(>|z|) > (Intercept) -2.03693352 1.449574526 -1.405194 0.159963578 > A 0.01093048 0.006446256 1.695633 0.089955471 > N 0.41060119 0.224860819 1.826024 0.067846690 > S -0.20651005 0.067698863 -3.050421 0.002285206 > > then I use confint(k.glm) to obtain a confidnece interval for the > estimates. > >> confint(k.glm,level=0.97) > Waiting for profiling to be done... > 1.5 % 98.5 % > (Intercept) -5.471345995 0.94716503 > A -0.002340863 0.02631582 > N -0.037028592 0.95590178 > S -0.365570347 -0.06573675 > > while reading the help for 'confint', i found something like confint.glm > for general linear model. > I load the MASS package by clicking on the Menu( or otherwise how should I > load the package?) > > then I still cant use the confint.glm command, what have I dont wrong? > > > How do I calculate this confidence interval for glm estimate manually?? > > for A, I use > 0.01093048 + c(-1,1) * 0.006446256 * qt(0.985,df=77) > which is a different interval i got from the confint(k.glm,level=0.97) > above. > > To be short, what's the right command to find the confidence interval for > glm estimats? > How do I verify it manully? > > Thanks. > > casper > > > -- View this message in context: http://n4.nabble.com/confint-for-glm-general-linear-model-tp954071p956666.html Sent from the R help mailing list archive at Nabble.com. ______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
