Standardization News

Data Points
Factors that Help with Setting Limits
Q. How many batches do we need to evaluate a control or specification limit? A. Click HERE to download the full article and read the answer.  
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Data Points
Q. How do measurement error and process capability affect the probability that a product meets a specification? What is the relationship between parameter estimates in Statistical Process Control (SPC) and parameter estimates used in process... more
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Data Points
A Consideration for Standard Deviation
Q. What is the minimum number of data points recommended to estimate standard deviation? A. Click HERE to download the full article and read the answer.
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Data Points
Relating Process Capability Indices and the Precision-to-Tolerance Ratio
Q. Is there an important connection between the process capability indices (CPU and CPL) and the precision-to-tolerance ratio? A. Click HERE to download the full article and read the answer.  
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Data Points
Estimation of Measurement Uncertainty
Q. How can measurement uncertainty be estimated? A. Click HERE to download the full article and read the answer.    
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Data Points
Their Use and Importance
 Q: What are detection limits and why are they important? A. Click HERE to download the full article and read the answer.  
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Data Points
What It Might Be
Q: How do we judge what the sample max (or min) might be when we don’t know it — assuming a normal distribution? A. Click HERE to download the full article and read the answer.
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Data Points
When More than the Mean and the Standard Deviation Are Needed
Q: Which method of quantile estimation should be used? A: Click HERE to download the full article and read the answer.
Data Points
What Precision Means
Q: What is precision and how is it interpreted in the context of ASTM test methods? A. Click HERE to download the full article and read the answer.  
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Data Points
Q: Can a product with a single inspection result that is worse than the specification limit by an amount not exceeding reproducibility (R) be considered as being in conformance with the specification?  A. Click HERE to download the full article and... more

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