PSPP Authors
                                       
     * Ben Pfaff wrote most of the program and the manual.

     * John Williams originally wrote the T-TEST procedure, which was 
       subsequently re-written by John Darrington

     * Jim Van Zandt translated the `julcal' date calculation package
       into C from code written by Michael Covington, which was based on
       formulae by Jean Meeus.

     * John Darrington wrote the T-TEST and ONEWAY procedures, and made 
       numerous revisions to other modules.