ggm (version 0.5)

pcor: Partial correlation

Description

Computes the partial correlation between two variables given a set of other variables.

Usage

pcor(u, S)

Arguments

u

a vector of integers of length > 1. The first two integers are the indices of variables the correlation of which must be computed. The rest of the vector is the conditioning set.

S

a symmetric positive definite matrix, a sample covariance matrix.

Value

• a scalar, the partial correlation matrix between variables u[1] and u[2] given u[-c(1,2)].

See Also

cor, parcor, correlations

Examples

data(marks)
## The correlation between vec and alg given ana and sta
 pcor(c("vec", "alg", "ana", "sta"), var(marks))
## The same
pcor(c(2,3,4,5), var(marks))
## The correlation between vec and alg given sta
 pcor(c("vec", "alg", "sta"), var(marks))
## The marginal correlation between ana and sta 
pcor(c("ana","sta"), var(marks))