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tp4645130
2012 Oct 05
1
Setting the desired reference category with contr.sum
...4 0 0 0 1 0
5 0 0 0 0 1
6 -1 -1 -1 -1 -1
In fact, I need number 1 to be the reference. How do I achieve that? Thank
you.
Regards,
Maxim
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