On Jul 26, 2011 Lao Meng wrote:
> glht(result, linfct = mcp(f_GROUP="Tukey") )
> Error in `[.data.frame`(mf, nhypo[checknm]) : undefined columns selected
It is almost certainly the underscore in the name ("_") that is causing the
problem. Try putting the term in quotes ("f_GROUP").
Regards, Mark.
-----
Mark Difford (Ph.D.)
Research Associate
Botany Department
Nelson Mandela Metropolitan University
Port Elizabeth, South Africa
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