qpK2ParCor {qpgraph} | R Documentation

## Partial correlation coefficients

### Description

Obtains partial correlation coefficients from a given concentration matrix.

### Usage

    qpK2ParCor(K)

### Arguments

`K` | positive definite matrix, typically a concentration matrix.

### Details

This function applies `cov2cor` to the given concentration matrix and then changes the sign of the off-diagonal entries in order to obtain a partial correlation matrix.

### Value

A partial correlation matrix.

### Author(s)

R. Castelo and A. Roverato

### References

Lauritzen, S.L. Graphical models. Oxford University Press, 1996.

### See Also

`qpG2Sigma`

### Examples

    require(graph)

    n.var <- 5 # number of variables
    set.seed(123)
    g <- randomEGraph(as.character(1:n.var), p=0.15)

    Sigma <- qpG2Sigma(g, rho=0.5)
    K <- solve(Sigma)

    round(qpK2ParCor(K), digits=2)

    as(g, "matrix")

[Package qpgraph version 2.21.2 Index]