bd-j/prospector

Dirichlet SFH prior

MohammadRih opened this issue · 2 comments

MohammadRih commented

Hello,

I'm trying to set up a model to use dirichlet prior for sfh but have trouble doing that. The problem is that I cannot find concentration parameter, $\alpha_{D}$, in the TemplateLibrary["dirichlet_sfh"]. How can I set up this parameter in my work?!

bd-j commented

Hi @MohammadRih the concentration parameter vector alpha can be adjusting by changing the parameters alpha and beta of the prior distributions for the elements of z_fraction at https://github.com/bd-j/prospector/blob/main/prospect/models/templates.py#L676

For symmetric dirichlet all alpha and beta should be changed to the same value.

See https://arxiv.org/abs/1010.3436 and https://arxiv.org/abs/1811.03637 for more info.

MohammadRih commented

Thanks for your kind and useful comment.