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.
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