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. Author manuscript; available in PMC: 2009 Oct 1.
Published in final edited form as: Atmos Environ (1994). 2008 Oct;42(33):7590–7599. doi: 10.1016/j.atmosenv.2008.06.041

TABLE 4.

Ordinary Least Squares Multivariate Regression Results for Roadway Concentrations (CLV, μg/m3)

Effect Estimate Standard Error t-value p-value Model-Based R2 CV R2
Intercept 9.53 3.73 6.54 0.01
Ambient PM2.5 (μg/m3) 1.36 0.18 57.39 <0.001 0.56
Total Trip Distance (km) 0.41 0.18 5.04 0.03 0.04
Overall Model Fit 0.60 0.49