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BLANDALTMAN: Stata module to create Bland-Altman plots featuring differences or %differences or ratios, with options to add a variety of lines and intervals

Author

Listed:
  • Mark Chatfield

    (University of Queensland)

Programming Language

Stata

Abstract

blandaltman produces Bland-Altman plots featuring (a) difference, (b) percentage difference or (c) ratio on the y-axis, and (arithmetic or geometric) mean on the x-axis. By default, regression-based bias and limits of agreement are produced in order to help everyone see how the distribution of (a), (b) or (c) varies with the average of the paired measurements (this is a key purpose of a Bland-Altman plot). Horizontal lines for bias and limits of agreement can be produced instead. This is the first community-contributed Bland-Altman plot command in Stata allowing display of confidence intervals for the bias and limits of agreement, as well as a prediction interval and (up to 3) tolerance intervals, assuming the distribution of (a), (b) or log (c) is normal and has no relationship with the magnitude of the measurements. Logarithmically-scaled axes are used (i) for both axes when ratios are plotted against the geometric mean, (ii) for the x-axis when percentage differences are plotted against the (arithmetic or geometric) mean.

Suggested Citation

  • Mark Chatfield, 2022. "BLANDALTMAN: Stata module to create Bland-Altman plots featuring differences or %differences or ratios, with options to add a variety of lines and intervals," Statistical Software Components S459040, Boston College Department of Economics, revised 28 Sep 2023.
    • Handle: RePEc:boc:bocode:s459040
    Note: This module should be installed from within Stata by typing "ssc install blandaltman". 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/b/blandaltman.ado
    File Function: program code
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    File URL: http://fmwww.bc.edu/repec/bocode/b/blandaltman.sthlp
    File Function: help file
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    File URL: http://fmwww.bc.edu/repec/bocode/l/labmeasures.dta
    File Function: sample data file
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    File URL: http://fmwww.bc.edu/repec/bocode/p/PEFR.dta
    File Function: sample data file
    Download Restriction: no
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