Add preprocessor interface for selecting proposal density
In the MCMC, we seem to have everything in place for using a student t-distribution as the proposal density, but we have no interface. Modify the estimation command to accept the following new options:
- proposal_distribution, which takes two arguments:
rand_multivariate_studentand maps to
student_degrees_of_freedom, which accepts an integer argument and maps to
These options already exist in
After doing this, we need to convert
tests/estimation/t_proposal/fs2000_student.mod to use this interface.