Following from this thread, I suggest we continue the discussion here.
I have revisited the “simplex” model you have offered in that post, as it has potential. I’d like to get a better understanding of it but, after an online search, I cannot find a reference to such an approach.
I fail to understand how the transition rate between S and E_1, \beta \frac{I_1 + I_2}{N} S, is handled. See the Liverpool model description.
I think I also miss the rationale behind the use of a simplex vector.
Thanks.