Hello, everyone,
aside from Rolf's hint (and Richard's warning!) you could also consider
relevel():
viagraData$dose <- relevel( viagraData$dose, ref = "placebo")
Hth -- Gerrit
On Fri, 5 Jun 2015, Rolf Turner wrote:
On 05/06/15 11:08, Jim Lemon wrote:
Hi James,
You can change the order of levels like this:
levels(viagraData$dose)<-c("placebo","low dose","high dose")
<SNIP>
As Richard Heiberger has pointed out, this is wrong.
What *does* work is:
viagraData$dose)<-factor(viagraData$dose,
levels=c("placebo","low dose","high dose")
This is a trap into which many a Young Player (including my very good self)
has fallen.
cheers,
Rolf Turner
--
Technical Editor ANZJS
Department of Statistics
University of Auckland
Phone: +64-9-373-7599 ext. 88276
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