On Wed, 8 Aug 2012, arun wrote:
The param factor has 54 levels. So, I guess the combinations that are not present will record as NA.
I noticed that but have not found an explanation. I'll work with the base data frame. Thanks, Rich ______________________________________________ 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.
