# [R] squared semi-partial correlation

N.Callow pes603 at bangor.ac.uk
Fri Aug 6 12:48:00 CEST 2004

```Hi, can you help? I am really struggling to find the answer to the
following question.

I have conducted a standard multiple regression using SPSS. The dependent
variable is CE, and the independent variables are Ibelieve and Tbelieve.
Because the independent variables are highly correlated I have examined the
squared semi-partial correlations. I
understand that the Ibelieve squared semi partial correlation accounts for
a significant proportion of the variance in CE t= 2.689, whereas the
tbelieve does not t = .556. However, I want to see if the squared
semi-partial correlations are significantly different TO EACH OTHER
(Ibelieve .168, Tbelieve .035 N= 220). How do I do this?  I assume that I
will need to do this "by hand" with an equation? Also, do I have to take
into account that the squared semi-partial correlations are correlated in
terms of the dependent variable?
Thanks very much.
Nichola

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http://www.shes.bangor.ac.uk/home.html
------------
Dr Nichola Callow (C.Psychol.)
School of Sport, Health, and Exercise Science
University of Wales, Bangor
George Building