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.

Select the link below for your machine type.

• Macintosh version. For the Macintosh version, you should also download the file updates.lsp, and put it in the folder Arc/Extras.
• MS Windows.
• Linux/Unix version.

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.