The Markov Chain Nest Productivity Model Estimating Tool (MCestimate) is a tool for estimating probabilities of failure in the presence of competing risks. It was originally developed to facilitate the study of causes of avian nest-failure. However, competing risks arise in virtually all stochastic processes and MCestimate can be applied in many contexts outside of avian nest failure. Listed below are links to download PDF versions of the User's Guide and the Technical Manual for MCestimate.You may need a PDF reader to view some of the files on this page. See EPA’s About PDF page to learn more.