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Fig. 4 | Virology Journal

Fig. 4

From: Spectroscopic methods for COVID-19 detection and early diagnosis

Fig. 4

Detection of SARS-CoV-2 with multivariable analysis. a Raw Spectra b Sample of 2nd derivative of Savitzky–Golay smoothened spectra of positive and negative samples. c, d, e First three latent variables of PLS-DA. (f) Coefficients of variables selected by the sparse classification algorithm of second derivatives of raw spectra (g, h) Zooms on regions indicated by sparse classification. i Projection of the 280 spectra used according to the first two latent variables obtained. j Projection of the 280 spectra used according to the first three latent variables obtained. (With permission from [53])

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