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Is Statistical Process Control Still Relevant?

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Control charts help to understand a process’s “personality,” know which questions to ask, when to intervene, and when to leave a process alone. Photo by Erik Kroon on Unsplash.

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In less than two months we will celebrate the 100th anniversary of the invention of the control chart, a tool most often associated with statistical process control (SPC). Considering SPC from our modern perspective made us ask, “Is SPC still relevant?”

The Test to Use Before All Other Tests

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Photo by Naser Tamimi on Unsplash.

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When presented with a collection of data from operations or production, many will start their analysis by computing descriptive statistics and fitting a probability model to the data. But before you do this, there’s an easy test that you need to perform.

What You Need to Know About Weibull Distributions

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Photo by Carlos Andres Gomez on Unsplash

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Over the past two months we’ve considered the properties of lognormal and gamma probability models. Both of these families contain the normal distribution as a limit.

What You Need to Know About Gamma Probability Models

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Photo by Scott Graham on Unsplash

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Clear thinking and simplicity of analysis require concise, clear, and correct notions about probability models and how to use them.

SPC Outside of Manufacturing

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So far in this series our focus has remained on statistical process control (SPC) in manufacturing.

What You Need to Know About Lognormal Models

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Photo by Marcel Ardivan on Unsplash

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When do we need to fit a lognormal distribution to our skewed histograms? This article considers the basic properties of the lognormal family of distributions and reveals some interesting and time-saving characteristics that are useful when analyzing data.

What Can Your Process Achieve?

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You are assigned a new task to demonstrate that an existing process will have the capability to meet newer and tighter specifications.

Modernizing Your SPC System Can Drive Huge Improvements in Quality and Cost

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Just a few decades ago, today’s personal technology was a science fiction pipe dream.

Measurement Data and Getting the Basics Right

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Parts 1, 2, and 3 of our series on statistical process control (SPC) have shown how data can be thoughtfully used to enable learning and improvement—and consequently, better product quality and lower production costs.

The Leptokurtophobia Pandemic

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Fourteen years ago, I published “Do You Have Leptokurtophobia?” Based on the reaction to that column, the message was needed.

Pagination

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