Curious about hygiene

Content related to occupational hygiene and exposure statistics. By John Padgham COH.

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Where to start
01Basic Hygiene Statistics → 02What’s a UCL? → 03Bayes for Beginners

Latest posts

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Bayesian methods

What’s a Prior?

An overview of priors in Bayesian data analysis, with a tool for exploring informative priors.

8 Feb 2026
Bayesian methods

Hierarchical Modelling

Why partial pooling beats assessing exposure data SEG-by-SEG.

27 Jan 2026

Featured tools

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Interactive web app
Sample Planner
How many samples for EN689 compliance? Simulates thousands of realistic scenarios to find the number that gives 80% confidence.
 Excel download
Hearing Threshold Level Calculator
Estimate hearing threshold shifts from age and noise exposure, per the ISO 1999 calculations.