1. Exploratory Data Analysis 1.3. EDA Techniques 1.3.3. Graphical Techniques: Alphabetic 1.3.3.31. Youden Plot 

Purpose: Interlab Comparisons 
Youden plots are a graphical technique for analyzing
interlab data when each lab has made two runs on the
same product or one run on two different products.
The Youden plot is a simple but effective method for comparing both the withinlaboratory variability and the betweenlaboratory variability. 
Sample Plot 
This Youden plot of the UGIANSKY.DAT data set shows:

Definition: Response 1 Versus Response 2 Coded by Lab 
Youden plots are formed by:

Questions 
The Youden plot can be used to answer the following
questions:

Importance 
In interlaboratory studies or in comparing two runs from the same lab, it is useful to know if consistent results are generated. Youden plots should be a routine plot for analyzing this type of data. 
DOE Youden Plot  The DOE Youden plot is a specialized Youden plot used in the design of experiments. In particular, it is useful for full and fractional designs. 
Related Techniques 
Scatter Plot 
Software  The Youden plot is essentially a scatter plot, so it should be feasible to write a macro for a Youden plot in any general purpose statistical program that supports scatter plots. 