A mirror of the Statistical Software Components archive at BC

Website: https://ssc-ng.net/archive/ — browse and search the packages in each snapshot, and get the ssc2 command to install them.

This repository contains a sequence of updates from the SSC Archive at BC.

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)

For more information, see the ssc2 project page.

What you can do on the website

The website lets you explore the snapshots without cloning anything:

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

How the mirror is created

See mirror.repec.sh. The process can take up to 60 minutes. The downloaded mirror is in the releases branch.

Date-stamped tags

Tags are created every time the archive is mirrored. See https://github.com/ssc-ng/archive/tags.

• The oldest tags are 2017-08-10, 2021-04-15, and 2021-08-10.
• The oldest tag with continuous daily snapshots is 2021-12-23
• For bugs in the set of tags, see ERRATA.

Using the mirror

While the ssc command in Stata will continue 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. Also see ssc2 for more streamlined functionality:

* ssc2 may be installed directly from GitHub
net install ssc2, all replace from("https://raw.githubusercontent.com/ssc-ng/ssc2/latest")

How to clone this repository

This repository can get big (over 20,000 objects, approx. 320 MB for a shallow clone). You are encouraged, if cloning to your local workspace, to do a "shallow" clone:

git clone --depth 1 https://github.com/ssc-ng/archive.git

Contributing

Fork, and create a pull request. For how the website is built, see site/README-site.md.

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.