[R] Random specification in LMER

Arnaud Ghilain arnaud.ghilain at usherbrooke.ca
Mon Apr 10 20:17:59 CEST 2006


Can anybody help me understand the difference between the three different codes
in specifying the slope in the random part of a mixed model using LMER?

Here are the codes:

(age | id)
(1 + age | id)
(age - 1 | id)

Thank you in advance


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