SYMPOSIA PAPER Published: 01 January 1976
STP32359S

Statistical Implications of the Environmental Protection Agency Procedure for Evaluating the Accuracy of Sulfur Dioxide and Nitrogen Oxide Monitors of Stationary Sources

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The statistical parameter identified in the Federal Register for evaluating the accuracy of monitoring systems of sulfur dioxide (SO2) and nitrogen oxide (NOx) from stationary sources is the absolute value of the mean plus the 95 percent confidence interval for a set of test data. The test data are derived by differencing simultaneous measurements by the monitoring system and a reference method. The probability that a system will fail the evaluation is a function of the mean and standard deviation of the errors in the system, the mean and standard deviation of the errors in the reference method, the number of data points used in the evaluation, and the acceptance level. An equation defining the probability of rejection is derived, and curves are presented showing this probability when nine measurements are used in the evaluation. The influence of errors in the reference method on the probability of rejection are discussed. Data from the evaluation of SO2 and NOx monitors at a power plant are presented and discussed briefly.

Author Information

Reeves, JB
University of Dayton Research Institute, Dayton, Ohio
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Developed by Committee: D22
Pages: 118–128
DOI: 10.1520/STP32359S
ISBN-EB: 978-0-8031-4674-7
ISBN-13: 978-0-8031-0297-2