robmed (version 0.9.0)

weights.cov_Huber: Robustness weights of Huber M-estimation of location and scatter

Description

Extract (relative) robustness weights of a Huber M-estimate of location and scatter.

Usage

# S3 method for cov_Huber
weights(object, type = c("consistent", "relative"), ...)

Arguments

object

an object inheriting from class "cov_Huber" containing Huber M-estimates of location and scatter.

type

a character string specifying the type of robustness weights to be extracted. Possible values are "consistent" and "relative". The former can be used for a robust transformation of the data such that the covariance matrix of the transformed data is Fisher consistent. Observations that are not downweighted in general receive a weight larger than 1. The latter are useful for interpretation, as observations that are not downweighted receive a relative weight of 1.

…

additional arguments are currently ignored.

Value

A numeric vetor containing the requested robustness weights.

References

Zu, J. and Yuan, K.-H. (2010) Local influence and robust procedures for mediation analysis. Multivariate Behavioral Research, 45(1), 1--44.

See Also

cov_Huber()

Examples

# NOT RUN {
data("BSG2014")

# define variables
x <- "ValueDiversity"
y <- "TeamCommitment"
m <- "TaskConflict"

# compute Huber M-estimator
S <- cov_Huber(BSG2014[, c(x, y, m)])
weights(S, type = "relative")

# }