paper in J. Statistical Software Vol. 17, issue 1 (linked from URL)

Ulrike Groemping, with contributions from Matthias Lehrkamp
R(>= 2.2.1), MASS, boot, survey, methods, mitools

relaimpo provides several metrics for assessing relative
importance in linear models. These can be printed, plotted and
bootstrapped. The recommended metric is lmg, which provides a
decomposition of the model explained variance into non-negative
contributions. There is a version of this package available
that additionally provides a new and also recommended metric
called pmvd. If you are a non-US user, you can download this
extended version from Ulrike Groempings web site.

c(person("Ulrike", "Groemping", role = c("aut", "cre"), email =
"groemping@beuth-hochschule.de"), person("Lehrkamp", "Matthias", role = "ctb"))
R(>= 2.2.1), MASS, boot, survey, mitools, graphics
Ulrike Groemping [aut, cre],
Lehrkamp Matthias [ctb]

Relative Importance of Regressors in Linear Models
Provides several metrics for assessing relative importance in linear models. These can be printed, plotted and bootstrapped. The recommended metric is lmg, which provides a decomposition of the model explained variance into non-negative contributions. There is a version of this package available that additionally provides a new and also recommended metric called pmvd. If you are a non-US user, you can download this extended version from Ulrike Groempings web site.

c(person("Ulrike", "Groemping", role = c("aut", "cre"), email =
"ulrike.groemping@bht-berlin.de"), person("Lehrkamp", "Matthias", role = "ctb"))

R(>= 2.2.1), MASS, boot, survey, methods, mitools, corpcor

Functions for Mapping Key-Value Pairs, Many-to-Many,
One-to-Many, and Many-to-One Relations
person("Dominic", "Jarkey", email = "dominic.jarkey@gmail.com", role = c("aut", "cre"))
Functions to safely map from a vector of keys to a vector of values, determine properties of a given relation, or ensure a relation conforms to a given type, such as many-to-many, one-to-many, injective, surjective, or bijective. Permits default return values for use similar to a vectorised switch statement, as well as safely handling large vectors, NAs, and duplicate mappings.