[R] testing diff for slopes and intercepts

[Peter Dalgaard BSA]

Bill Simpson <wsi at gcal.ac.uk> writes:

> This parametrization automatically compares
> inta vs intb
> inta vs intc
> But how to get test for diff of intb vs intc?
> 
> Same question for slope: I already have
> slopea vs slopeb
> slopea vs slopec
> But how to get test for diff of slopeb vs slopec?

This is the sort of thing relevel() is for.

-- 
   O__  ---- Peter Dalgaard             Blegdamsvej 3  
  c/ /'_ --- Dept. of Biostatistics     2200 Cph. N   
 (*) \(*) -- University of Copenhagen   Denmark      Ph: (+45) 35327918
~~~~~~~~~~ - (p.dalgaard at biostat.ku.dk)             FAX: (+45) 35327907
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