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occurences
2011 Nov 18
0
NB and poisson glm models: three issues
...the NB model is too
much i believe)
- Sometimes there exist a datapoint that predicts 1000 times more occurences
than what would be expected.
- Sometimes the model with offset predicts sensible results but if I take
the offset and use log(variable) I obtain some datapoints that predict many
more occurenes than what would be expected.
I have tried to create an example of the aforementioned problems. However, i
only achieved to recreate my first problem (normally 20% of increase is
shown). And as it happens, no problem is shown in realtion to my third
problem as the predicted and observed values ar...