[R] how to concatenate factor vectors?

[Sam Steingold]

> * 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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