Quantitative data analysis with SPSS 12 and 13 : a guide for social scientists / Alan Bryman and Duncan Cramer. Bryman, Alan. Cramer, Duncan, 1948- SPSS for Windows. Social sciences Statistical methods Computer programs. HA32 .B798 2005 300.15195 BRQ Includes bibliographical references (p. 355-358) and index. London ; Routledge, 2005. 2005. 2005 Text xxv, 367 p. : eng