Standards and Statistics



Standards And Statistics

Control and Specification Limits

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 a PDF of the full article... more
Industry Sectors: 
Quality


Standards And Statistics

Meeting Material Specs, Part 2

Q. How do measurement error and process capability affect the probability that a product meets a specification? What is the relationship between... more
Industry Sectors: 
Quality


Standards And Statistics

Why 30?

A Consideration for Standard Deviation
Q. What is the minimum number of data points recommended to estimate standard deviation? A. Click here to download a PDF of the full article. Go to... more
Industry Sectors: 
Quality


Standards And Statistics

Meeting Material Specs

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 for the full... more
Industry Sectors: 
Quality


Standards And Statistics

Uncertainty: Part 2

Estimation of Measurement Uncertainty
Q. How can measurement uncertainty be estimated? A. Click to view full article and a discussion of uncertainty and Bayes Rule. Go to other Data... more
Industry Sectors: 
Quality


Standards And Statistics

Uncertainty: Part 1

Relation to Precision
Q. How are precision and uncertainty related? A. Click for the full article and a discussion of these measurements. Go to other Data Points articles ... more
Industry Sectors: 
Quality


Standards And Statistics

Detection Limits

Their Use and Importance
Q: What are detection limits and why are they important? A. Click for the full article and a discussion of detection limits. Go to other Data Points... more
Industry Sectors: 
Quality


Standards And Statistics

The Sample Max (or Min)

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 for the full article and... more
Industry Sectors: 
Quality


Standards And Statistics

Can a Moving Average of the Data Be Deceptive?

Sometimes I want to take a
moving average of my data to
reduce the noise I am seeing, but
can I actually fool myself?... more
Industry Sectors: 
Quality


Standards And Statistics

Assessing Crack Detection Capability

What statistical procedure is used to determine the typical crack size that can be detected with a given probability?... more
Industry Sectors: 
Transportation
Construction
Energy
Medical
Safety
Quality
Environment
Consumer Products
Metals & Materials
Chemicals

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