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. 2019 Aug 28;19(17):3723. doi: 10.3390/s19173723

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© 2019 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).

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Box plots of the top 10 predictors sorted by out-of-bag importance estimates for each regressed pollutant. These pollutants were (a) NO₂, (b) CO, (c) NMHC, (d) Gasoline, (e) CO₂, and (f) CH₄. Boxes indicate the variation in the predictor importance when models were trained on different cross-validation folds.

Box plots of the top 10 predictors sorted by out-of-bag importance estimates for each regressed pollutant. These pollutants were (a) NO₂, (b) CO, (c) NMHC, (d) Gasoline, (e) CO₂, and (f) CH₄. Boxes indicate the variation in the predictor importance when models were trained on different cross-validation folds.