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. 2023 Jan 31;9:e34982. doi: 10.2196/34982

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©Canelle Poirier, Guillaume Bouzillé, Valérie Bertaud, Marc Cuggia, Mauricio Santillana, Audrey Lavenu. Originally published in JMIR Public Health and Surveillance (https://publichealth.jmir.org), 31.01.2023.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work, first published in JMIR Public Health and Surveillance, is properly cited. The complete bibliographic information, a link to the original publication on https://publichealth.jmir.org, as well as this copyright and license information must be included.

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(A) Error values obtained at the national level for the flu and gastroenteritis for forecasts up to 10 weeks with the RF model. The solid line corresponds to the results obtained with the random forest (RF) model using only historical data. The dotted line corresponds to the results obtained with the RF model using historical data and both Google and EHR data. The red color is the results for gastroenteritis disease, whereas the blue color is the results for the flu. This style line and color code are used for the 4 panels of this figure. (B) Correlation values obtained at the national level. (C) Error values obtained at the regional level. (D) Correlation values obtained at the regional level. EHR: electronic health record.