Does the computation for Bland Altman plots. This will usually be called from graphic functions like bland.altman.plot but will be usefull for customized plot (see examples for color coded BA plot). Offers symmetric confidence intervalls for bias and upper and lower limits.
Bland-Altman Plots for assessing agreement between two methods of clinical measurement and returning associated statistics. Plots are optionally extended by confidence intervals as described in "J. Martin Bland, Douglas G. Altman (1986): Statistical Methods For Assessing Agreement Between Two Methods Of Clinical Measurement" but not included in the graphics of that publication. Either base graphics or ggplot2 can be used.