Sorry, sorry....
of course 
levels(testf)[c(2,1,3)]

will do the job

My excuses to all

Anne

PS I will meditate the following saying
"la parole est d'argent et le silence est d'or"

BONNES FETES A TOUS
SEASONAL GREETINGS


----------------------------------------------------
Anne Piotet
Tel: +41 79 359 83 32 (mobile)
Email: anne.piotet@m-td.com
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M-TD Modelling and Technology Development
PSE-C
CH-1015 Lausanne
Switzerland
Tel: +41 21 693 83 98
Fax: +41 21 646 41 33
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