netmeta: netimpact – R documentation

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netimpact

Determine the importance of individual studies in network meta-analysis

Description

This function measures the importance of individual studies in network meta-analysis by the reduction of the precision if the study is removed / ignored from the network.

Usage

netimpact(
  x,
  seTE.ignore = 100 * max(x$seTE, na.rm = TRUE),
  event.ignore = 0.01,
  verbose = FALSE
)

Arguments

`x`	An object of class `netmeta`.
`seTE.ignore`	Assumed (large) standard error in order to mimicking the removal of individual studies from the network meta-analysis (ignored for `netmetabin` objects).
`event.ignore`	Assumed event number mimicking the removal of individual studies from the network meta-analysis (considered for `netmetabin` objects).
`verbose`	A logical indicating whether information on the estimation progress should be printed.

Value

An object of class "netimpact" with corresponding netgraph and print function. The object is a list containing the following components:

`impact.fixed`	A matrix with contributions of individual studies (columns) to comparisons (rows) under the fixed effects model.
`impact.random`	A matrix with contributions of individual studies (columns) to comparisons (rows) under the random effects model.
`ignored.comparisons`	List with comparisons of ignored study.
`seTE.ignore, event.ignore, x`	As defined above.
`nets`	List of all network meta-analyses (removing a single study).
`version`	Version of R package netmeta used to create object.

Author(s)

Guido Schwarzer sc@imbi.uni-freiburg.de, Gerta Rücker ruecker@imbi.uni-freiburg.de

Examples

data(parkinson)

# Only consider first four studies (to reduce runtime of example)
#
p1 <- pairwise(list(Treatment1, Treatment2, Treatment3),
               n = list(n1, n2, n3),
               mean = list(y1, y2, y3),
               sd = list(sd1, sd2, sd3),
               data = subset(parkinson, Study < 5),
               studlab = Study)

net1 <- netmeta(p1)
ni1 <- netimpact(net1, verbose = TRUE)
ni1

netgraph(ni1)

netmeta

Network Meta-Analysis using Frequentist Methods

v1.4-0

GPL (>= 2)

Authors

Gerta Rücker [aut] (<https://orcid.org/0000-0002-2192-2560>), Ulrike Krahn [aut], Jochem König [aut] (<https://orcid.org/0000-0003-4683-0360>), Orestis Efthimiou [aut] (<https://orcid.org/0000-0002-0955-7572>), Guido Schwarzer [aut, cre] (<https://orcid.org/0000-0001-6214-9087>)

Initial release

2021-05-11