# Richard Hogan

• ### How to Calculate Resolution Uncertainty

Introduction Resolution Uncertainty is a factor that contributes to uncertainty in measurement. It’s influence should be considered in every uncertainty budget. However, evaluating resolution uncertainty can vary depending on several factors. So, I have created this guide to help you appropriately identify and evaluate the resolution uncertainty of various measurement equipment. In this guide, I […]

• ### 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 […]

• ### Most Popular Articles of 2015

Read the 10 Most Popular Articles on measurement uncertainty from 2015 and get a sneak peak of the articles I’m publishing in 2016. Just Scroll to the bottom! Introduction Another year has passed and it’s hard to believe that it has been 4 years since I started ISOBudgets. If you asked me four years ago […]

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• ### 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 […]

• ### 23 Must Have Items to Survive an ISO 17025 Accreditation Audit

Introduction Preparing for a ISO/IEC 17025:2005 accreditation assessment is stressful, especially if it is your first assessment. No matter how much experience you have with ISO17025 accreditation assessments, you will always be a little nervous and unsure of the outcome. To help ease the stress of your upcoming assessment, I have prepared a list of […]

• ### How to Calculate Normalized Error

Calculating normalized error is common for laboratories participating in proficiency testing or interlaboratory comparisons. If you have participated in a proficiency test before, you may have noticed it in your final summary report either by name or abbreviated ‘En.’ When you participate in proficiency tests, the PT provider calculates normalized error for you. However, if […]