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Table 2

Cumulative emission estimates and variance weighted least squares regressions on OTM33A facility estimate (OFE) relative to study onsite estimate (SOE) at paired facilities. DOI: https://doi.org/10.1525/elementa.266.t2

StatisticAll facilities with paired OFE & SOE
Simulated unloadings
Paired Facilities Subdivided by Largest SOE Category

Simulated pneumaticsSimulated pneumaticsODM or simulated observed/unmeasured

 
Number of facilities 43 19 20 
Statistically similar estimates 28 15 11 
Cumulative OFE (kg/h)a 67 (+39/–15) 51 (+38/–15) 2.9 (+1.9/–0.75) 13 (+5.3/–2.1) 
Cumulative SOE (kg/h)a 709 (+634/–377) 688 (+622/–376) 1.6 (+0.64/–0.43) 19 (+7.7/–3.0) 
Fraction of Cumulative SOE 100% 97.10% 0.20% 2.70% 
Cumulative OFE/Cumulative SOE 9% 7.40% 179.00% 67.20% 
Correlation coefficient, r 0.913 0.843 0.523 0.448 
Variance Weighted Least Squaresa,b,c,d Slope 0.49 (+0.58/–0.20) 0.76 (+3.5/–0.48) 2 (+5.5/–1.6) 0.41 (+0.51/–0.17) 
R2 –35 –192 0.27 0.02 
StatisticAll facilities with paired OFE & SOE
Simulated unloadings
Paired Facilities Subdivided by Largest SOE Category

Simulated pneumaticsSimulated pneumaticsODM or simulated observed/unmeasured

 
Number of facilities 43 19 20 
Statistically similar estimates 28 15 11 
Cumulative OFE (kg/h)a 67 (+39/–15) 51 (+38/–15) 2.9 (+1.9/–0.75) 13 (+5.3/–2.1) 
Cumulative SOE (kg/h)a 709 (+634/–377) 688 (+622/–376) 1.6 (+0.64/–0.43) 19 (+7.7/–3.0) 
Fraction of Cumulative SOE 100% 97.10% 0.20% 2.70% 
Cumulative OFE/Cumulative SOE 9% 7.40% 179.00% 67.20% 
Correlation coefficient, r 0.913 0.843 0.523 0.448 
Variance Weighted Least Squaresa,b,c,d Slope 0.49 (+0.58/–0.20) 0.76 (+3.5/–0.48) 2 (+5.5/–1.6) 0.41 (+0.51/–0.17) 
R2 –35 –192 0.27 0.02 

a 95% Confidence bounds indicated.

b Linear regression with intercept of 0.

c R2 is a measure of goodness of fit in y-axis only and does not consider goodness of fit in x-axis. Negative R2 can result from regression with no intercept.

d Emission estimates without error bounds (0BOT measurements) receive a weight of zero in fitting process.

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