II. Probability and Statistics for Reliability
A. Basic concepts

7. Statistical process control (SPC) and process capability (Understand)

Define and describe SPC and process capability studies (Cp, Cpk, etc.), their control charts, and how they are all related to reliability.

Now that we have built control charts, lets review what happening and what we’re looking for on the charts.

Additional References

When are we out of control (article)

Quick Quiz

II. Probability and Statistics for Reliability
A. Basic concepts

7. Statistical process control (SPC) and process capability (Understand)

Define and describe SPC and process capability studies (Cp, Cpk, etc.), their control charts, and how they are all related to reliability.

Details for the charts that deal with attribute data.

Additional References

Quick Quiz

II. Probability and Statistics for Reliability
A. Basic concepts

7. Statistical process control (SPC) and process capability (Understand)

Define and describe SPC and process capability studies (Cp, Cpk, etc.), their control charts, and how they are all related to reliability.

Details for the individuals and moving range chart, or when you have a string of individual readings to chart.

Additional References

Individuals and Moving Range Charts ) (article)

Quick Quiz

II. Probability and Statistics for Reliability
A. Basic concepts

7. Statistical process control (SPC) and process capability (Understand)

Define and describe SPC and process capability studies (Cp, Cpk, etc.), their control charts, and how they are all related to reliability.

Before getting into details with each of types of control charts, lets spend a moment sorting out how to select the right chart to use.

Additional References

Variable Selection for Control Charting (article)

Selecting Control Charts (article)

Quick Quiz

II. Probability and Statistics for Reliability
A. Basic concepts

7. Statistical process control (SPC) and process capability (Understand)

Define and describe SPC and process capability studies (Cp, Cpk, etc.), their control charts, and how they are all related to reliability.

We start with the foundational set of control charts, the X̄ and R charts.

Additional References

8 steps to Creating a X-bar and R control chart (article)

X-bar and Sigma Charts (article)

8 Steps to creating an X-bar and s control chart (article)

Quick Quiz

II. Probability and Statistics for Reliability
A. Basic concepts

7. Statistical process control (SPC) and process capability (Understand)

Define and describe SPC and process capability studies (Cp, Cpk, etc.), their control charts, and how they are all related to reliability.

In this lesson the focus is on an introduction to the broad topic of process control charts.

Additional References

Statistical Process Control Overview (article)

Special and Common Causes of Process Variation (article)

Introduction to Control Charts (article)

Variable Selection for Control Charting (article)

Variables Control Chart Background (article)

Quick Quiz

II. Probability and Statistics for Reliability
A. Basic concepts

6. Sample size determination (Apply)

Use various theories, tables, and formulas to determine appropriate sample sizes for statistical and reliability testing.

Let’s quickly answer this very common question.

Additional References

Three Elements of Sample Size Concerning Decision Making (article)

Three considerations for sample size (article)

SPC Sample Size (recorded webinar)

Hypothesis Test Sample Size (article)

Sample size problem (article)

Sample size (article)

Sample Size – success testing (article)

SOR 058 How Many Samples to Test (podcast)

Quick Quiz

II. Probability and Statistics for Reliability
A. Basic concepts

5. Non-parametric statistical methods (Apply)

Apply non-parametric statistical methods, including median, Kaplan-Meier, Mann-Whitney, etc., in various situations.

Non-parametric work with reliability or comparisons.

Additional References

The Wald Wolfowitz Run Test for Two Small Samples (article)

Moods Median Test (article)

Levene’s Test (article)

Contingency Coefficient (article)

Kaplan-Meier Reliability Estimator (article)

Quick Quiz

II. Probability and Statistics for Reliability
A. Basic concepts

5. Non-parametric statistical methods (Apply)

Apply non-parametric statistical methods, including median, Kaplan-Meier, Mann-Whitney, etc., in various situations.

Let’s talk about a few approaches that use ranking.

Additional References

Kruskal-Wallis Test (article)

Spearman Rank Correlation Coefficient (article)

Mann-Whitney U Test (article)

Quick Quiz

II. Probability and Statistics for Reliability
A. Basic concepts

5. Non-parametric statistical methods (Apply)

Apply non-parametric statistical methods, including median, Kaplan-Meier, Mann-Whitney, etc., in various situations.

What is a non-parametric versus parametric statistical test or method.

Additional References

Quick Quiz