```
# example from Bortz, J. (1993) Statistik fuer Sozialwissenschaftler, Springer, pp. 413
abstr <- c(9,11,13,13,14,9,10,11,10,8,13,7,9,13,14)
coord <- c(8,12,14,13,14,8,9,12,8,9,14,7,10,12,12)
age <- c(6,8,9,9,10,7,8,9,8,7,10,6,10,10,9)
# calculate the correlation of abstr and coord, after without the effect of the age
CorPart(cbind(abstr, coord, age), 1:2, 3)
# by correlation matrix m
m <- cor(cbind(abstr, coord, age))
CorPart(m, 1:2, 3)
# ... which would be the same as:
lm1 <- lm(abstr ~ age)
lm2 <- lm(coord ~ age)
cor(resid(lm1), resid(lm2))
```

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