ALT Sample Size
Abstract
Chris and Fred discuss how many samples you need to conduct Accelerated Life Testing or ALT … and a little bit about what ALT is.
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SOR 851 ALT Sample Size
SOR 649 Extrapolation and Sample Sizes
Extrapolation and Sample Sizes
Abstract
Chris and Fred discuss (essentially) how many ‘things’ you need to see to know enough about those ‘things.’ We see this conundrum across all sorts of fields of study. How many kangaroos do I need to capture and weigh to get a good understanding of the entire population’s typical weight? Delete kangaroo and insert whatever thing matters to you.
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SOR 573 What do We Have Confidence In?
What do We Have Confidence In?
Abstract
Chris and Fred discuss what it means to have confidence in something. Confidence can mean all things to all people. How confident are you as a person? How confident are you in someone else? What confidence do you have in a conclusion? Statisticians and reliability engineers need to talk to each other where the term confidence has a clearly defined and fixed meaning. But does it? How confident are you in the results of a test? How confident are you in a test that has 75 data points versus one that has 70? How confident will your boss be in you when you present the outcomes of these tests? Have these tests shaken YOUR confidence? Best you listen to this podcast.
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SOR 473 Reliability and Sample Size
Reliability and Sample Size
Abstract
Adam and Fred discussing the difficulties of selecting the correct sample size for reliability demonstration testing.
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Fundamentals of Sample Size Determination
Fundamentals of Sample Size Determination
podcast episode
A common question about reliability testing is “what is the sample size?” It is also a difficult question to answer well. The right sample size is a balance between cost, accuracy, and variability. In some cases, we also consider the time to results.
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