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When installing SPSS, following the general defaults should allow you to begin using the program.
The UCLA Institute for Digital Research and Education has an Installing SPSS guide that outlines Extension Programs, user-written programs for use with SPSS.
The SPSS Environment utilizes multiple types of windows/screens for basic operations. Each window is associated with a specific task and type of SPSS files.
Kent State University's Interacting with SPSS page on their SPSS guide provides details on the SPSS Environment.
Variables are a vital part of all datasets within SPSS. They show how your research was conducted and determine the types of statistical analysis area appropriate. Variable types include numeric, comma, dot, date, etc.
Kent State's SPSS Guide outlines Variable Types.
