Practical resources
Tools & learning resources
Find an explanation for the question you are working on, see the assumptions behind it and follow the relevant sources.
What are you working on?
Choose a resource by the question.
GUIDE / 01
What analytical quality is needed for the intended use?
Analytical performance specifications
Open resourceGUIDE / 02
What evidence should I collect before introducing a method?
Method verification and validation
Open resourceGUIDE / 03
Why do two methods appear to agree but give different results?
Method comparison
Open resourceGUIDE / 04
Am I describing variation or the precision of a mean?
SD, CV, standard error and confidence intervals
Open resourceGUIDE / 05
What can I conclude from an EQA result?
External quality assessment
Open resourceGUIDE / 06
What does a control signal tell me?
Internal quality control
Open resourceGUIDE / 07
How should I record an uncertainty evaluation?
Document, report and review uncertainty
Open resourceGUIDE / 08
Where can I read the underlying guidance?
Source library
Open resourceExplore the ideas interactively
Existing educational tools, grouped in one place.
Interactive tool
Distribution viewer
Explore probability distributions and their summary statistics.
Open tool ↗
Interactive tool
One-sample t-test calculator
Explore a comparison between a sample mean and a specified reference value.
Open tool ↗Visual explanations
Follow a figure, then read the explanation.
ILLUSTRATED GUIDE
See why SD and standard error differ
Explore the guideILLUSTRATED GUIDE
Compare RMS, RMSE and sample SD
Explore the guideILLUSTRATED GUIDE
Explore concentration-dependent uncertainty
Explore the guideSpecialist material: APTT TR Viewer · Suggest a correction