Figure 3 | Scientific Reports

Figure 3

From: Soft and Robust Identification of Body Fluid Using Fourier Transform Infrared Spectroscopy and Chemometric Strategies for Forensic Analysis

Figure 3

Identification of the ATR FT-IR spectra of non-BF samples as outliers using Q-statistics for each BF group. (a) A discrimination scheme using a PLS-LDA model for the five BF types followed by Q-tests for each BF type. (b) Average ATR FT-IR spectra of prepared non-BF samples, including milk, soy sauce, ketchup, vegetable sauce, olive oil, mayonnaise, shampoo, laundry detergent, toothpaste, glue, cotton cloth, jeans and polyester cloth. All spectra were normalized by the total area. (c) PLS-DA scores for the ATR FT-IR spectra of the non-BF samples, predicted by the five-class PLS-DA model for fresh BFs (black dots).

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