Add -1 to your glm to remove the intercept term -- that will force Friday to have its own coefficient.
E.g., dg <- data.frame(value = rnorm(28), day = letters[1:7]) lm(value ~ day, data = dg) lm(value ~ day - 1, data = dg) Michael On Thu, Feb 9, 2012 at 6:58 PM, Abraham Mathew <abmathe...@gmail.com> wrote: > Let's say I have a variable, day, which is saved as a factor with 7 levels, > and I use it in a > logistic regression model. I ran the model using the car package in R and > printed out the > results. > > mod1 = glm(factor(status1) ~ factor(day), data=mydat, > family=binomial(link="logit")) > print(summary(mod1)) > > The result I get is: > > Coefficients: > Estimate Std. Error z value Pr(>|z|) > (Intercept) -0.4350 0.0379 -11.48 <2e-16 *** > factor(day)Monday -0.6072 0.0479 -12.69 <2e-16 *** > factor(day)Saturday 0.5964 0.0559 10.67 <2e-16 *** > factor(day)Sunday 1.1140 0.0627 17.78 <2e-16 *** > factor(day)Thursday -0.4492 0.0516 -8.71 <2e-16 *** > factor(day)Tuesday -0.9331 0.0496 -18.82 <2e-16 *** > factor(day)Wednesday -0.8575 0.0486 -17.63 <2e-16 *** > > > It seems that Friday is being used as the baseline, but I want to know > > how I can acquire the coefficient for the baseline (friday)? > > > I ran mod1$coefficients, but that didn't do the trick. > > > Can anyone help. > > > Thank you, > > Abraham M. > > [[alternative HTML version deleted]] > > ______________________________________________ > 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. ______________________________________________ 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.
