# Uncertainty

• ### Calculate Calibration Uncertainty in Accordance with ILAC P14

Introduction Calculating calibration uncertainty is a problem for many accredited laboratories. Since the introduction of the ILAC P14 policy, the number of deficiencies related measurement uncertainty have exponentially grown. Additionally, I have received a lot of phone calls from labs needing help to calculate calibration uncertainty. Therefore, I decided to write an article to […]

• ### Introduction to Statistics for Uncertainty Analysis

Introduction to Statistics Estimating uncertainty in measurement requires a good understanding of Statistics and statistical analysis. While there are many free statistics resources online, no one has created a statistics guide specifically for the estimation of uncertainty in measurement. In this article, I have compiled a comprehensive list of the statistical functions to help you […]

• ### Expanded Uncertainty And Coverage Factors for Calculating Uncertainty

Introduction Expanded uncertainty and coverage factors are an important part of calculating uncertainty. Calculating them is not very difficult, but coverage factors can be a little confusing. To prevent you from using the wrong coverage factor to calculate expanded uncertainty, I have prepared this article to show you how to find the right coverage factor […]

• ### 8 Sources of Uncertainty in Measurement for Every Uncertainty Budget

Introduction Have you ever wondered what sources of uncertainty in measurement to include in your uncertainty budget? I have, and I am sure that you have too. Today, I am going to teach you 8 sources of uncertainty in measurement that should be include in every uncertainty budget. The reason that you should include […]

• ### Probability Distributions for Measurement Uncertainty

Probability distributions are a part of measurement uncertainty analysis that people continually struggle with. Today, my goal is to help you learn more about probability distributions without having to grab a statistics textbook. Although there are hundreds of probability distributions that you could use, I am going to focus on the 6 that you need to […]

• ### 3 Ways to Combine Measurement Uncertainty with Different Units of Measure

Introduction A couple of months ago, I wrote a 7 step guide to calculate measurement uncertainty. While the majority of feedback that I received informed me that the guide was helpful, I also received a few comments that the guide was missing more advanced topics; specifically, sensitivity coefficients. Therefore, I decided to write […]

• ### 3 Exemptions to Reporting Uncertainty Now!!

Exemptions and uncertainty to two terms that are not commonly phrased together in metrology. However, ILAC has made provisions for exemptions to reporting uncertainty in measurement while maintaining requirements for accredited calibrations. This article will explore the three exemptions to reporting uncertainty in calibration reports as per the ILAC P14:01/2013. If you are still reporting […]

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• ### The Easy Way to Calculate CMC Uncertainty

One of the most frequently asked questions that I receive is “How do I convert my uncertainty estimates to a formula?” In my last post, I showed you how to calculate CMC Uncertainty using the equations in your scope of accreditation. Now, I am show you have to reduce your uncertainty estimates to an equation. […]

• ### How to Calculate CMC Uncertainty Like A Pro

Have you ever looked at your scope of accreditation and wondered, “How do I calculate uncertainty with this equation?” If so, you are in luck! I am going to show you step by step, how to calculate CMC uncertainty using the equations in your scope. Over the last two months, I have received a […]

• ### Top Posts of 2014

Each month, I write one or two articles and post them on my blog. My goal is to appeal to my readers and gain new subscribers. If not, what reason would I have for a blog! Last year (i.e. 2014) was a good year for me. It was a busy year! However, I still made […]

• ### What You Should Know About CMC Uncertainty

If you are an ISO/IEC 17025 accredited laboratory, you have probably heard the acronym CMC before. It is commonly used on a calibration laboratory’s scope of accreditation to express the laboratory’s measurement capability. If you are a testing laboratory, you are probably less familiar with this acronym; but, you shouldn’t be. Many testing laboratories are […]

• ### 3 Steps To Reduce Measurement Uncertainty

Reducing measurement uncertainty has become a goal for many laboratories seeking to improve quality. Whether it is enhance their reputation or make themselves more competitive in the marketplace, many want to improve their measurement capabilities. To help organizations accomplish this goal, I have compiled a list of three highly-effective methods to reduce measurement uncertainty.   […]