Bland–Altman plots allow identification of any systematic difference between the measurements (i.e., fixed bias) or possible outliers. See Analyse-it, MedCalc, NCSS, GraphPad Prism, R, or StatsDirect for software providing Bland–Altman plots.īland–Altman plots are extensively used to evaluate the agreement among two different instruments or two measurements techniques. It can also be used to compare a new measurement technique or method with a gold standard, as even a gold standard does not-and should not-imply it to be without error. One primary application of the Bland–Altman plot is to compare two clinical measurements each of which produced some error in their measures. This version of the plot is used in MA plot. A high correlation does not necessarily imply that there is good agreement between the two methods.Ĭonsider a sample consisting of n A high correlation for any two methods designed to measure the same property could thus in itself just be a sign that one has chosen a widespread sample. Bland and Altman drive the point that any two methods that are designed to measure the same parameter (or property) should have good correlation when a set of samples are chosen such that the property to be determined varies considerably.
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