metasens (version 1.5-3)

lfkindex: LFK Index Test for Asymmetry

Description

Implementation of the LFK index test proposed by Furuya-Kanamori et al. (2018) to evaluate bias in meta-analysis.

Usage

lfkindex(TE, seTE, data = NULL)
# S3 method for lfkindex
print(x, digits = 2, ...)

Value

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

lfkindex

LFK index.

interpretation

Interpretation of value of LFK index.

abs.zscore

Absolute value of z-score.

N, MidRank, percentile, zscore

Quantities used to calculate LFK index.

TE, seTE

Estimated treatment effect, standard error.

version

Version of R package metasens used to create object.

Arguments

TE

An object of class meta or estimated treatment effect in individual studies.

seTE

Standard error of estimated treatment effect (mandatory if TE not of class meta).

data

An optional data frame containing the study information.

x

An object of class lfkindex.

digits

Minimal number of significant digits, see print.default.

...

Additional arguments (ignored).

Author

Gerta Rücker , Guido Schwarzer

References

Furuya-Kanamori L, Barendregt JJ, Doi SAR (2018): A new improved graphical and quantitative method for detecting bias in meta-analysis. International Journal of Evidence-Based Healthcare, 16, 195--203

Schwarzer G, Rücker G, Semaca C (2024): LFK index does not reliably detect small-study effects in meta-analysis: a simulation study. Research Synthesis Methods, Accepted for publication

See Also

doiplot, metabias, funnel.meta

Examples

# Example from Furuya-Kanamori et al. (2018)
#
pain <- data.frame(SMD = c(-4.270, -1.710, -0.580, -0.190, 0.000),
                   varSMD = c(0.158,  0.076,  0.018,  0.022, 0.040))

lfk.pain <- lfkindex(SMD, sqrt(varSMD), data = pain)
lfk.pain

doiplot(lfk.pain)