R help - Mar 2011 - Correlation

Hi all,

Assume I have a data set collected in a related family.


dat <- read.table(textConnection(" Id Father Mother x y
1   0   0     15   26
2   0   0     18   14
3   1   2     12   25
4   0   2     15   30
5   1   0     19   28"), header=TRUE)

xx=dat$x
yy=dat$y

I want to analyze the correlation *between x and y by accounting the
relationship among
ID, father and Mother.* The relationship among these individuals is stored
in matrix
AM. AM is a symmetric 5 by 5 matrix.

AM  matrix looks like
      [,1]   [,2] [,3]   [,4]  [,5]
[1,]  0.5  0.0 0.50 0.00  0.5
[2,]  0.0  1.0 0.50 0.50  0.0
[3,]  0.5  0.5 0.50 0.25  0.5
[4,]  0.0  0.5 0.25 1.00  0.0
[5,]  0.5  0.0 0.50 0.00  1.0


How do I use this AM matrix in the calculation of correlation between
variables x and y

Cor(xx,yy)

Is it possible to do it in R?

Thanks in advance

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