how to concatenate factor vectors?
* Jeff Newmiller <wqarjzvy at qpa.qnivf.pn.hf> [2012-10-18 07:53:24 -0700]: If you HAVE defined your factors using explicit levels definitions, you should have no trouble combining them.
http://article.gmane.org/gmane.comp.lang.r.general:277719
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