Why is it that once I have downloaded the files, I can not decompress or read them?
You need the appropriate version of the program in order to decompress and read information: To decompress the data, you need the WinZip program with a minimum 9.0 version, which can be downloaded at http://www.winzip.com/downwz.htm To read the manual coding archives and questionnaires, Adobe Acrobat is required with a minimum version of 5.0. This can be obtained at: http://www.adobe.com/products/acrobat/readstep.html The format for the database is STATA 8.0. Without this program or version, it is still possible to convert databases in a different format using the StatTransfer, which can be downloaded at http://www.data-transfer-software.com/html/downloads.