st: Parameter restrictions in MLE

[Deepankar Basu <basu.15@osu.edu>]

I am trying to do a maximum likelihood estimation where some of the
parameters of the model are probabilities; hence they should add up to
unity. 

What is the best way to put restrictions on the relevant parameters and
constrain them to add up to unity?

Any help will be appreciated. 

Deepankar Basu 

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