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Engineering Statistics Handbook Episode 1 Part 10

Tham khảo tài liệu 'engineering statistics handbook episode 1 part 10', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | 1.3.3.31. Youden Plot hW ENGINEERING STATISTICS HANDBOOK TOOLS raids I search back NEKT 1. Exploratory Data Analysis 1.3. EDA Techniques 1.3.3. Graphical Techniques Alphabetic 1.3.3.31. Youden Plot Purpose Youden plots are a graphical technique for analyzing interlab data when Interlab each lab has made two runs on the same product or one run on two Comparisons different products. The Youden plot is a simple but effective method for comparing both the within-laboratory variability and the between-laboratory variability. Sample Plot This plot shows 1. Not all labs are equivalent. 2. Lab 4 is biased low. 3. Lab 3 has within-lab variability problems. 4. Lab 5 has an outlying run. http www.itl.nist.gov div898 handbook eda section3 eda3331.htm 1 of 2 5 1 2006 9 57 09 AM 1.3.3.31. Youden Plot Definition Response 1 Versus Response 2 Coded by Lab Youden plots are formed by 1. Vertical axis Response variable 1 i.e. run 1 or product 1 response value 2. Horizontal axis Response variable 2 i.e. run 2 or product 2 response value In addition the plot symbol is the lab id typically an integer from 1 to k where k is the number of labs . Sometimes a 45-degree reference line is drawn. Ideally a lab generating two runs of the same product should produce reasonably similar results. Departures from this reference line indicate inconsistency from the lab. If two different products are being tested then a 45-degree line may not be appropriate. However if the labs are consistent the points should lie near some fitted straight line. Questions The Youden plot can be used to answer the following questions 1. Are all labs equivalent 2. What labs have between-lab problems reproducibility 3. What labs have within-lab problems repeatability 4. What labs are outliers 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. DEX Youden Plot The dex