Davis, Jacob B. <JBDavis <at> txfb-ins.com> writes: > > Thanks for humbling yourself to my level and not answering my question. > > If object is user defined is: > object$df.residual > the same thing as > df.residual(object) >
df.residual() is an extractor function. stats:::df.residual.default gives: function (object, ...) object$df.residual <environment: namespace:stats> so yes, in general they are the same thing. It's better to use the extractor function rather than $ if possible; while it doesn't appear that anyone has written a class of objects that have a different method for extracting the residual degrees of freedom, they could -- or someone could change the internal representation of lm and glm objects (unlikely though that is) to mean that object$df.residual was missing, or even wrong. Ben Bolker ______________________________________________ R-help@stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html
