matthewjones43 <matthew.jones <at> kellogg.ox.ac.uk> writes: > > Hi, I am not a statistician and so I am sure whatever it is I > am doing wrong > must be an obvious error for those who are...Basically I can > not understand > why I get NA for variable 'CDSTotal' when running a glm? > Does anyone have an > idea of why this might be happening?
It might be useful to look at http://stackoverflow.com/questions/7337761/ linear-regression-na-estimate-just-for-last-coefficient/7341074#7341074 (broken URL). You are overfitting the model by including a predictor that can be expressed as a linear combination of other predictors, and R is trying to handle it automatically. ______________________________________________ R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see 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.
