The GRETL program (Gnu Regression, Econometrics, and Time-series Library) is included in the CD accompanying the book. It is the successor to ESLWIN which was distributed with the previous edition of this book. The program is also available in other platforms such as Unix and Linux. GRETL is built around a freely shared library that may be accessed using a command-line interface program (GRETLCLI) or a graphical user interface (GRETL). If you have the CD, simply run the self-extracting executable program setup.exe. If you don't have the CD, download gretl_install.exe and run it. You will be prompted for a location to install the package (the default is c:\userdata\gretl, but you can change it to suit your situation). The complete manual is also available on the CD as the PDF file manual.pdf. It is readable by Adobe Acrobat Reader, which is available free. If you plan to use GRETL, be sure to save the file to your hard drive, print out the complete manual, and keep it handy. Since the GRETL program is updated often, it is wise to check periodically for updates. You could get on the GRETL mailing list and be notified of changes. To reproduce all the examples in the book, there are 73 command files labeled "scripts" (denoted by the label PSX-Y.INP, where X is the chapter number) that can be readily run from GRETLCLI and GRETL.