Le 16/02/2018 à 10:24, Peter Dalgaard a écrit :
To give a short answer to the original question:
On 16 Feb 2018, at 05:02 , Rolf Turner <[email protected]> wrote:
In order to ascribe unique values to the parameters, one must apply a "constraint". With
the "treatment contrasts" the constraint is that
beta_1 = 0.
...and consequently, being a constant, has an s.e. of 0.
It makes sense !
Thanks for the precision !
Marc
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