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LFK: Stata module to compute LFK index and Doi plot for detection of publication bias in meta-analysis

Author

Listed:
  • Luis Furuya-Kanamori

    (Research School of Population Health, Australian National University)

  • Suhail AR Doi

    (College of Medicine, Qatar University)

Programming Language

Stata

Abstract

lfk generates the Doi plot and estimates the LFK index to detect and quantify asymmetry of study effects. The Doi plot replaces the conventional scatter (funnel) plot of precision versus effect with a folded normal quantile (Z-score) versus effect plot. The studies form the limbs of this plot, if there is asymmetry there will be unequal deviation of both limbs of the plot from the mid-point or more studies making up one limb compared to the other. In the absence of asymmetry, it would be expected that a perpendicular line to the X-axis from the tip of the Doi plot would divide the plot into two regions with similar areas. The LFK index quantifies the difference between these two regions in terms of their respective areas under the plot and the difference in the number of studies included in each limb. The closer the value of the LFK index to zero, the more symmetrical the Doi plot. LFK index values outside the interval between -1 and +1 are deemed consistent with asymmetry (i.e. publication bias).

Suggested Citation

  • Luis Furuya-Kanamori & Suhail AR Doi, 2020. "LFK: Stata module to compute LFK index and Doi plot for detection of publication bias in meta-analysis," Statistical Software Components S458762, Boston College Department of Economics, revised 16 Oct 2021.
    • Handle: RePEc:boc:bocode:s458762
    Note: This module should be installed from within Stata by typing "ssc install lfk". The module is made available under terms of the GPL v3 (https://www.gnu.org/licenses/gpl-3.0.txt). Windows users should not attempt to download these files with a web browser.
    as

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    File URL: http://fmwww.bc.edu/repec/bocode/l/lfk.ado
    File Function: program code
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    File URL: http://fmwww.bc.edu/repec/bocode/l/lfk.sthlp
    File Function: help file
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