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Youden Plot Top Prev Next
Sample Youden plot

  • Question:
    Are all labs equivalent?
    What labs have between-lab problems (reproducibility)?
    What labs have within-lab problems (repeatability)?
    What labs are outliers?

  • Definition:
    Vertical Axis: Response for Run 1
    Horizontal Axis: Response for Run 2
    Plot Character: Laboratory ID

  • Interpretation/Conclusion:
    Not all labs are equivalent
    Lab 4 is biased low
    Lab 3 has within-lab variability problems
    Lab 5 has an outlying run

  • NIST/SEMATECH Handbook Chapter:
    1. Exploratory Data Analysis

  • Reference:
    Youden (1959), Graphical Diagnosis of Interlaboratory Test Results, Industrial Quality Control, 15, pp. 24-28.

    Chambers, Cleveland, Kleiner, and Tukey (1983), Graphical Methods for Data Analysis, Wadsworth.

Dataplot Command: YOUDEN PLOT Y1 Y2 LAB
Dataplot Code:
SKIP 25
READ UGIANSKY.DAT Y1 Y2 LAB
CHARACTERS 1 2 3 4 5 6 7 8 9
LINES BLANK ALL
YOUDEN PLOT Y1 Y2 LAB

Dataplot Reference Manual Documentation for YOUDEN PLOT


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Date created: 06/05/2001
Last updated: 09/30/2016

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