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score2
2007 Aug 20
1
Ask for functions to obtain partial R-square (squared partial correlation coefficients)
...contribution of one explanatory variable when all others are already
included in multiple linear regression model.
The following link has very clear explanations on partial and
semi-partial correlation:
http://www.psy.jhu.edu/~ashelton/courses/stats315/week2.pdf
In SAS, the options is PCORR2 and SCORR2.
For example(from http://www.ats.ucla.edu/stat/sas/examples/alsm/alsmsasch7.htm)
data ch7tab01;
input X1 X2 X3 Y;
label x1 = 'Triceps'
x2 = 'Thigh cir.'
x3 = 'Midarm cir.'
y = 'body fat';
cards;
19.5 43.1 29.1 11.9
24.7 49.8 28.2...