A mirror of the Statistical Software Components archive at BC

This repository holds a sequence of date-stamped snapshots of the SSC Archive at Boston College. A new snapshot is taken (and tagged with its date) every time the archive is mirrored.

Status

Mirror workflow Latest tag

How can you use it?

Use the ssc2 package to install from date-stamped snapshots of SSC:

* Install from SSC
ssc install ssc2

* The current stable release
net install ssc2, all replace from("https://raw.githubusercontent.com/ssc-ng/ssc2/latest/")

* install packages
ssc2 install <package_name>, date(<YYYY-MM-DD>)
* e.g. ssc2 install reghdfe, date(2026-10-20)

Explore the snapshots

  • Select packages: pick a snapshot, search its packages, tick the ones you want, and get the ssc2 command that installs them as they stood on that day.
  • Compare: see which packages were added, removed or changed between any two snapshots.
  • Package history (under development): in which snapshots a package is available, and when its package file changed.
  • Availability: the contiguous ranges of date tags, the earliest and the latest, and the reasons for the gaps.

Using the mirror directly

While the ssc command in Stata continues to go to the original location, you can leverage versioned packages from this mirror:

global sscdate "2021-12-21"
global sscmirror "raw.githubusercontent.com/ssc-ng/archive/$sscdate/"
net install a2reg, from(https://${sscmirror}fmwww.bc.edu/repec/bocode/a) all

where the date 2021-12-21 corresponds to an existing tag.

How the mirror is created

See notes in Github repository. For known gaps and errors, see the ERRATA.

License

The code that creates this repository is under a BSD-3 license. All other code (the mirror) is under whatever license the original authors granted.