Fundamental statistics for social research : step-by-step calculations and computer techniques using SPSS for Windows / Duncan Cramer. Cramer, Duncan. SPSS for Windows. Social sciences Statistical methods Computer programs. HA32 .C68 1997 300.727 CRF Includes bibliographical references (p.[445]-449) and index. London : Routledge, 1998. 1998. 1998 Text xxi 456 p. : eng