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Results of 10-fold cross validation of Ca data for different multivariate methods (a) Lasso regression (R2 (log) = 0.85), (b) Gaussian process regression (GPR) (R2 (log) = 0.89), (c) partial least squares regression (PLSR) (seven components, R2 (log) = 0.87), and (d) PLSR of second field (six components, R2 (log) = 0.90).
