Ok I am writing a paper draft where I want to include a table of equations used in different models. Some models use standard Cox models, others use the Andersen Gill counting process formulation with delayed entry.

I can represent the Cox models as follows:

My question is how can I denote and Andersen Gill delayed entry model? I can’t find examples in the literature analgous to the picture.

By the way I have no clue how to render latex here but for completeness here is the latex code for that:

`h\left(t\right)\ ~\ e^{\gamma_0\cdot\left(\gamma_1.group\right)}`

Many thanks.

Edit: there is an error it should be gamma0 + (gamma1 * group)