Curious about hygiene.
Long-form posts and tools to help better understand exposure data. By John Padgham, COH.
Start here — the learning path
Latest posts
All posts →The Best Worst Graph
Sometimes a chart is so messed up it’s almost beautiful.
What’s a Prior?
An overview of priors in Bayesian data analysis, with a tool for exploring informative priors.
Hierarchical Modelling
Why partial pooling beats assessing exposure data SEG-by-SEG.
Featured tools
All tools →
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.