Stock Investment Guide (SIG) perform fundamental stock analysis, using the methods used by stock clubs. SIG generates buy, hold, and sell levels for the stock being analyzed. SIG can read and write standard .ssg file formats, create semi-logarithmic graphs of stock data, and perform a complete stock investment guide. Users can input stock data by hand, or download thousands of .ssg data files from the national association for investments clubs with their online Stock Data Service. Users can also trade .ssg files with fellow club members, even if other members use Windows