How can you express the quantile function of a Gompertz–Makeham model?

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Robert Long

I think in general you need to use a numerical approximation of the Lambert W function, but Jodra (2009) obtained a closed form solution for the quantile function of the Gompertz–Makeham distribution:

http://www.sciencedirect.com/science/article/pii/S0378475409000445

Mário Rui Mota Ferreira

Thanks Robert, that was the solution I've been using. Cheers