Multilevel Modeling



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aML Multiprocess Multilevel Modeling
aML is powerful statistical software for multilevel and multiprocess models. It supports multilevel hazard, (censored/truncated) linear, ordered and unordered categorical, and count outcomes. You may mix and match corresponding model types with correlations at any level and simultaneously estimate a wide class of multiprocess models. In particular, aML excels in selection models and models with potentially endogenous covariates. More product information.

aML Is Now Free!

aML is no longer sold for a fee. We have placed it in the public domain and you may download a copy, free of charge, from this website. The download includes executable files for various computing platforms, documentation, and source code. Unfortunately, we cannot provide technical support with the free version (though we still might if you ask nicely after checking this page).


This page was marginally updated on 15 June 2023. Send comments to