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Cpk vs. Ppk: Clearing Up the Confusion

How are process capability index (Cpk) and process performance index (Ppk) different, and why does it matter? Our columnist offers an explanation.

Aug 05, 2025

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Reporting of Non-Detect Laboratory Results

How should we report non-detects and low-concentration data? Our columnists offer an answer.

Apr 30, 2025

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The Committee on Quality and Statistics: A History

The committee on quality and statistics (E11) was officially established in 1946, and its first chairman was the statistician Harold F. Dodge.

Mar 12, 2025

How to Handle Nonconstant Variance in a Linear Regression Analysis

Nov 06, 2024

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How Do You Round Fractions? Significant Digits and Converting to a Decimal

In the latest Data Points, statistics expert Katie Daisey, Ph.D., explains some of the main ways people round fractions to decimals.

Sep 06, 2024

Statistical Process Control Charts and Managing Multiplicity

In the latest Data Points column, Thomas Bzik breaks down how to address out-of-control signals.

Jul 02, 2024

Solving Statistics Problems: How to Work with Difficult Data

From histograms to other tools, here is how you can make use of historical statistics or other forms of difficult data.

May 08, 2024

The Meaning of Statistical Confidence

In the latest Data Points, we break down statistical confidence, statistical intervals, and other related concepts.

Mar 06, 2024

Revisiting Statistical Intervals: Common Statistical Intervals, Interval Selection, and Examples

In the latest Data Points column, Stephen Luko and Jennifer Brown revisit several past columns to offer a high-level overview of statistical intervals.

Jan 09, 2024

Some fine points of determining conformity to specification

In the latest Data Points column, Peter Fortini discusses the absolute and rounding methods when comparing a test result to a specification limit.

Nov 01, 2023

Data Points - How can a laboratory demonstrate its proficiency?

In the latest Data Points column, statistician Polona Carson, Ph.D., gives an answer.

Aug 31, 2023

What are Certified Reference Materials?

An introduction to reference materials, certified reference materials, and relevant standards.

Jul 05, 2023