Have time-varying input for sex ratio at birth

[shajiang93]

Now the SRB is fixed across countries and years.

[IvanWilli]

Yes. We can think in accepting a vector, equal length than years. In case some difference, complete constant in the right.
I think this is safer than add a data.frame indicating years

[IvanWilli]

Hi @shajiang93,
What do you mean with countries? the ratio is fixed but you can set it in the function argument