Alferes, V. R., & Kenny, D. A. (2009). SPSS programs for the
measurement of nonindependence in standard dyadic designs. Behavior
Research Methods, 41(1), 47-54.
are avalaible for downloading in the site:
http://www.fpce.uc.pt/niips/inter.htm
Valentim R. Alferes
University of Coimbra (Portugal)