Arc is a free statistical analysis tool for regression problems, as described in the book Applied Regression Including Computing and Graphics. Read the copyright for Arc.

If you are new to Arc, select the link below for your machine type.

• Macintosh version.
• MS Windows, all versions. If you are using internet explorer, you can see a short movie on how to install Arc on Windows here.
• Linux/Unix version.

If you already have Arc installed on your computer, find out if an upgrade is recommended.

Arc is based on Luke Tierney's Xlisp-Stat. When you download Arc, you get Xlisp-Stat as well. The current version of Arc is version 1.06, July, 2004.