![]() ![]() Then, the repeatability of the methods is calculated. The new method has a larger mean but a larger variance as well. The first table displays the descriptive statistics for the two methods. Interpreting the results of a Bland Altman method When you click OK, the computations are done and the results are displayed. In the other tabs the options are left unchanged. In the Options tab, we do not select the Difference plot option as the Bland Altman plot is already a type of difference plot. As the experiments have been replicated, we need to specify the mouse ID in the first column and select it. Select the data that correspond to the first method, then to the second method. When you click on the button, a dialog box appears. ![]() Setting up a Bland Altman methodĪfter opening XLSTAT, select the Laboratory data analysis/Method Comparison (Bland Altman.) feature Our goal is to check if it is possible to use the new method instead of the reference one. The first method is currently considered as the reference, but it is much more expensive than the second and new method. Two methods are being tested each on 2 of the 4 sub-samples. For each mouse, a blood sample has been taken and divided into four homogeneous sub-samples. The data correspond to a medical experiment during which the concentration of an antibody is measured for 8 mice submitted to 8 different doses of a new molecule being tested. Dataset for method comparison with the Bland Altman method XLSTAT provides a series of tools to evaluate the performance of a method compared to another. If a new measurement method is cheaper than a standard, but if there is a known and fixed bias, you might take into account the bias while reporting the results. If there is a difference, you might be interested in knowing if this is due to a bias that depends on where you are on the scale variation. When developing a new method to measure the concentration or the quantity of an element (molecule, micro organism, …) you might want to check whether it gives results that are similar to a reference or comparative method or not. Method comparison with the Bland Altman method This tutorial will show you how to draw and interpret a Bland Altman plot to compare methods in Excel using the XLSTAT statistical software. ![]()
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