bachnguyen-tomo

Hey there, is there a way to do it **without** using a numba ufunc? I'm trying to use it with a scikit-learn model and those two libraries are just not...

This is mentioned [here](https://lifelines.readthedocs.io/en/latest/Survival%20Regression.html#aalen-s-additive-model) as an artifact of the model. My intuition for that is because of the additive form of the hazard function, rather multiplicative and exponentiated like Cox....

@fkiraly The equation above assumes that the hazard function is **non-negative** though, which is the main drawback of the regressor, it doesn't guarantee non-negative hazard. [First page](https://www.medicine.mcgill.ca/epidemiology/hanley/bios601/Encyclopedia%20of%20Biostatistics2ndEd2005.pdf).