pspp is a tool for statistical analysis of sampled data. It reads the data, analyzes the data according to commands provided, and writes the results to a listing file, to the standard output or to a window of the graphical display. The language accepted by pspp is similar to those accepted by SPSS statistical products. The details of pspp's language are given later in this manual. pspp produces tables and charts as output, which it can produce in several formats; currently, ASCII, PostScript, PDF, HTML, and DocBook are supported.