Pearson Correlation Matrix
> r0
           IM         EM         AM
IM  1.0000000  0.4188059 -0.1674647
EM  0.4188059  1.0000000 -0.1702416
AM -0.1674647 -0.1702416  1.0000000


Partial Pearson Correlation Matrix (Shrinkage Method)
> r1
           IM         EM         AM
IM  1.0000000  0.3651419 -0.1020439
EM  0.3651419  1.0000000 -0.1058074
AM -0.1020439 -0.1058074  1.0000000
attr(,"lambda")
[1] 0.09255092
attr(,"lambda.estimated")
[1] TRUE
attr(,"class")
[1] "shrinkage"
attr(,"spv")
       IM        EM        AM 
0.8466568 0.8459876 0.9659698