On 22 Dec 2006, Brian Ripley wrote: > 'update' will update and (by default) re-fit a model. It does this > by extracting the call stored in the object, updating the call and > (by default) evaluating that call. Sometimes it is useful to call > 'update' with only one argument, for example if the data frame has > been corrected.
Thanks. I understand now that this is the expected behavior per the documentation. It is just that when I call 'update (m1, ~ . - z)' I did not expect x to change (or everything can be different if mydata has changed). I only wanted to evaluate the old model with old data but sans the z variable. Would it be useful to have an option in update() not to update the data (i.e., behaves more like drop1())? Michael ______________________________________________ R-devel@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-devel
