Develop multinomial models

[cedric]

Data selection

The selection in multinomial must exclude transport stations or use the transport as a factor in the model, or use two separate models for transport and other.
Apply same filters ...
Correct current setting to adapt from gamma model using 20 000 observations.

Model fit

• check that no two dimensional plots are done if the response is not bi-dimensional
• model fit
• test using delta gamma density predictions in multinomial
• test using riverwidtm or logriverwithm
• test using s(riverwidtm)
• test model using only delta prediction ? => not the best model
• try to center and reduce variables ...
• produce graph for model fit
• test distance from gibraltar

Predictions

• use the model predictions to predict the whole size structure delta* gamma * mutlinomial_p