Thanks a lot, Marc! Dimitri On Mon, Mar 11, 2013 at 4:28 PM, Marc Schwartz <marc_schwa...@me.com> wrote:
> > On Mar 11, 2013, at 1:46 PM, Dimitri Liakhovitski < > dimitri.liakhovit...@gmail.com> wrote: > > > Hello, and apologies for not providing an example. However, my question > is > > more general. > > > > I have a lengthy function. This function is using another internal > function > > that modifies the data frame I am reading in. This internal function is > > using the command model.frame (with data and weights inside) and returns > a > > data frame I am using for further analyses. > > However, when I try to run my function (which has an lm or a glm > commmand) > > using that new data frame and separately defined weights, I get an error: > > can't find your weights object. > > This happens despite the fact that I actually print the weights object > > right before the glm command. The object is there - I can see it using > > ls(). I checked and rechecked - there are no typos. > > Interestingly, this happens only when I run it as a function. > > > > When I rename my arguments, go inside the function and run it line by > line > > - I don't get this problem. Clearly, something is happening with my > weights > > in the function environment. I was thinking - can it be that once I've > used > > model.frame - everything else - like glm and lm - is confused as to what > > the weights are and doesn't want to take the weights I hand over to it > but > > is looking for them elsewhere? > > > > Thank you! > > Dimitri > > > Many discussions on this over the years, along with the 'subset' argument. > From the Details section of ?lm: > > All of weights, subset and offset are evaluated in the same way as > variables in formula, > that is first in data and then in the environment of formula. > > You might also review: > > http://developer.r-project.org/nonstandard-eval.pdf > > This post by Thomas from 2006 may be helpful: > > http://tolstoy.newcastle.edu.au/R/devel/06/06/5869.html > > and the reply from Peter also: > > http://tolstoy.newcastle.edu.au/R/devel/06/06/5868.html > > Regards, > > Marc Schwartz > > -- Dimitri Liakhovitski [[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.
