NIST TN 1297: 4. Type B Evaluation of Standard Uncertainty
The National Institute of Standards and Technology (NIST) has published a technical note outlining methods for evaluating standard uncertainty in measurements. The document focuses on Type B evaluations, which are based on scientific judgment and available information rather than statistical data.
Key methods for Type B uncertainty evaluation include:
1. Converting quoted uncertainties to standard uncertainties by dividing by multipliers (e.g., 5 for 95% confidence)
2. Using normal distribution models to estimate uncertainty intervals
3. Considering the reliability of uncertainty evaluations based on available information
The document emphasizes the importance of using well-founded methods and empirical data to ensure reliable uncertainty evaluations, particularly when limited statistical data is available.
Keywords: uncertainty evaluation, measurement uncertainty, probabilistic distribution
