So the issue is something to do with the [['xxx']] construction of your data.
Can you explain what thats' all about - as it errors all over the shop when I try using that... You've set me on a mission to find the answer! So I'd really like to recreate a little bit of your data here, and play... C ******************************************************************************************************************** This message may contain confidential information. If yo...{{dropped:21}} ______________________________________________ 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.