Zero (and one?) adjusted Dirichlet?

[p-schaefer]

Would it be possible to implement a 0 (and maybe even 0 and 1) adjusted dirichlet distribution, similar to:

Tsagris, M., & Stewart, C. (2018). A Dirichlet Regression Model for Compositional Data with Zeros. Lobachevskii Journal of Mathematics, 39(3), 398–412. doi:10.1134/s1995080218030198

[StatMixedML]

Thanks for your interest in the project.

This is similar to StatMixedML/LightGBMLSS#17. I haven't really considered extending the Dirichlet in that way, but I add it to the ToDos. Thanks for pointing me to this!