Mixture model in Pumas

How-to
1

Hi all, does Pumas have mixture model functionality? I’m haven’t found anything in the documentation with regards to it. Thanks!

1 Like
2

Welcome to the community @ashwin. The current release does not include Mixture Model handling, but this is planned and will be in an upcoming release.

3

Hi all. I also need mixture model functionality. Is it available now?

4

Dear Masato Fukae,

Unfortunately, it is not yet available.

Best,
Patrick

1 Like
5

Hi Pumas community,

I am still trying to make a mixture of sub-populations somehow. I expected Categorical in the @random block to work, but it did not. Is there some workaround? It would be great if anyone gives me an idea.

Thanks,
Masato

6

Let me post a code fragment to be more specific.

    @random begin
        ηkd ~ Normal(0, sqrt(Ωkd))
        ηbase ~ MvNormal(Ωbase)
        # subpop ~ Categorical(p1, p2, p3, p4)
        subpop ~ Categorical(p1, p2)
    end
7

I don’t think Categorical is supported. The list of supported distributions are at Defining NLME models in Pumas · Pumas.

8

Thank you for your quick response. I was trying it because I found it here PumasModel-Error models · Pumas. But maybe available distributions are different between @random and @derived. And only continuous ones are ready in @random so far. Is my understanding correct? If so, do you have some ideas about how to generate discrete- or bi-modal-like distributions using currently available ones?