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road_structure
2013 Jan 18
1
Error in mer_finalize(ans) : Downdated X'X is not positive definite, 8.
...radii (100m, 250m, 500m, 1000m and 2000m). For each radii I have generated
a set of all possible models from the given 7 variables related to this
radii.
I have tried to account for random effects. A spatial random effect ? the
structure itself as a repeated measurement, by adding the term
(1|Road_Structure). A temporal random effect ? the observation session (is
it correct to say that this examines possible learning in time ?), by adding
the term (1|Session.ord).
I have generated 4 sets for each radii: 1) with both random effects, 2+3)
only one (each) random effect, and 4) none.
I have tried...