The panel shows the three mean-sd (standard deviation) plots for normalized+transformed (transformed), and normalized+transformed+batch corrected (batch corrected) assay values. The sd and mean are calculated feature-wise from the values of the respective data set. The plot allows to visualize if there is a dependence of the sd on the mean. The red line depicts the running median estimator (window-width 10%). In case of sd-mean independence, the running median should be approximately horizontal.
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