Bland-Altman method comparison tutorial

Learn how to assess the agreement between two methods of measurement.

In a 1986 issue of The Lancet, Bland & Altman published a paper that changed how method comparison studies are performed. In 1999, they published a follow-up paper that extended their earlier work to many different scenarios.

If you prefer you can watch a video of this tutorial.

In this tutorial you will perform the following tasks:

1. Plotting the relationship between methods
   
2. Estimating the average bias and the limits of agreement
   
3. Understanding the importance of repeatability
   
4. Using repeated measurements
   
5. Dealing with a relationship between difference and magnitude of measurement
   
6. Transforming the measurements to remove a relationship between differences and magnitude
   
7. Estimating regression based limits of agreement when transformation is not enough
   
8. Estimating nonparametric limits of agreement in non-normally distributed data