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. Author manuscript; available in PMC: 2021 Feb 15.
Published in final edited form as: Atmos Environ (1994). 2020 Jan 20;223:10.1016/j.atmosenv.2020.117300. doi: 10.1016/j.atmosenv.2020.117300

Figure 3 -.

Figure 3 -

Variable importance in projection (VIP) scores illustrating wavenumbers most important when calibrating IBR, SSR, and HIPS measurements to the FT-IR spectra using the PLS algorithm. A good fit was observed between the SSR and IBR measurements and spectra according to the coefficient of determination (R2) equal to 0.870 and 0.806, respectively. VIP scores greater than or “near” 1 are generally considered important in describing the relationship between the dependent and predictor variables (Chong and Jun 2005).