The SPSS guide to data analysis for SPSSx - Norusis, M. J. (Marija J.), 1948-. (Chicago, Ill. : SPSS, 1988)
On t.p.'x' is superscript following the second'SPSS' in the title.
Includes index.
Bibliography: p. 394.
Keywords: SPSS X (Computer program).; Social sciences -- Computer programs; Social sciences -- Statistical methods