This is the replication package for "How Magic Is Zero? An Empirical Analysis of Initial Development Releases in Three Software Package Distributions" accepted for publication in SoHeal 2020. The notebooks in "notebooks/" require the dependencies specified in "requirements.txt" to be installed. They rely on data files in "data/". These data can be obtained by running the "convert.py" scripts in that folder. The script requires data files from "data-raw/". These files can be generated by running "extract.py" in that folder. This script requires the libraries.io data dump, as explained in the README file contained in this folder. If you don't have these data, or if you don't want to download them, you can ask for the required data/*.csv.gz files by email.