Valentim R AlferesValentim R. Alferes is Professor of Psychology at the University of Coim-bra, Portugal, where he has been teaching courses in social psychology and research methods in psychology at the undergraduate and graduate levels for over 20 years. His ain scientific interests and publications are in the domains of sexuality, close relationships, dyadic data analysis, and experi-mental design. He has delivered lectures and conducted workshops on methodological and statistical topics at several Portuguese universities and has also maintained an SPSS Syntax Files website since 2002. He earned a PhD in social psychology from the University of Coimbra in 1995.http: //www.fpce.uc.pt/niips/ Read More Read Less