Reproducible Environments

A colleague needs more than your code to reproduce a return or risk estimate. The dataset, package versions, configuration and random seed can all affect the result. This lesson records those inputs and checks a run from clean state. A virtual environment isolates packages; Git identifies the code revision.

Learning objectives. By the end of this note you should be able to identify the ingredients of a reproducible run, inspect versions and explain why a fixed seed is necessary but insufficient.