Bar Charts Enhance Bland-Altman Plots When Value Ranges are Limited

摘要

ObjectiveA common form of validation study compares alternative methods for collecting data. Bland and Altman [–] recommend a graphic approach that pairs observations across methods and plots their mean values versus their difference. This method provides only limited information, however, when the range of observed values is small relative to the number of observations. This brief report shows how adding a simple bar chart to a Bland-Altman plot adds essential additional information.