Bland-Altman plot

A Bland-Altman plot is a visual tool used to compare two different measurement methods. It shows the difference between their readings for each subject against the average of those readings. This helps identify how closely the methods agree, whether their differences are consistent or vary across the range, and if any bias exists (one method systematically measuring higher or lower). It's useful in clinical and research settings to ensure new measurement techniques match established ones, promoting accuracy and reliability without assuming they are interchangeable.