Determine uncertainty of collection of data

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    Data Uncertainty
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SUMMARY

The discussion focuses on determining the uncertainty of calibration data in a liquid calibration lab applying for ISO 17025. The user performs four tests on flow meters and calculates percentage errors for each test. It is established that using the standard error (standard deviation of the mean) is the conventional method for reporting statistical error. However, with only four data points, the uncertainty in the calculated uncertainty can be approximately 40%, highlighting the limitations of small sample sizes in statistical analysis.

PREREQUISITES
  • Understanding of ISO 17025 standards
  • Knowledge of statistical error concepts, specifically standard error
  • Familiarity with flow meter calibration processes
  • Basic proficiency in data analysis techniques
NEXT STEPS
  • Research ISO 17025 requirements for calibration laboratories
  • Learn about calculating standard error and its implications
  • Explore methods to increase sample size for more accurate uncertainty estimation
  • Investigate advanced statistical techniques for uncertainty analysis
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Calibration laboratory technicians, quality assurance professionals, and anyone involved in the calibration and testing of measurement instruments seeking to understand uncertainty in data collection.

Mariob
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Hello, I work in a liquid calibration Lab and we are applying for ISO 17025. Basically we verify customers flow meters against our standard and capture the data onto our calibration report. An example is I would perform 4 tests of a specific flow rate and calculate the error in % for each test. Ex: test1 = .12%, test2 = .08%, test3 = .14% and test4 = .09%. How would I determine the uncertainty based on the given data.
 
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You could use the standard error (standard deviation of the mean) which is the 'standard' way of reporting statistical error. However, with only four pieces of data you will have an uncertainty in your uncertainty of roughly 40%. If you are unfamiliar with standard error there are plenty of resources online to help which a google search will turn up.
 

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