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From the glossary in Cohen (2003) p 678 "Semipartial correlation coefficients. Also called part correlations, the unique correlation of a variable with Y: the square root of its unique contribution to R**2." Cohen, Jacob, et al (2003) Applied multiple regression/correlation analysis for the behavioral sciences, third edition. Lawrence Erlbaum Associates, Mahwah, NJ. ISBN 0-8058-2223-2 LoC HA31.3 .A67.2003 Cohen, et al is an excellent reference on correlation and regression. Another way to express it is the square root of the change in R**2 on the last step of a hierarchical (i.e., stepped) set of regression equations. Art [log in to unmask] Social Research Consultants University Park, MD USA (301) 864-5570 sonia garcia wrote: >Hi all, >Could someone please explain what park correlations are? I have been asked to test the significance between park correlations and normal correlations and I am feeling a little bit too lost.... > >Thanks in advance, >Sonia. > > >--------------------------------- >Correo Yahoo!: 6MB, más protección contra el spam ¡gratis! > > >