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(A) Comparison of the predicted values and the residuals for skin impedance measurements (blue dots, standardized residual; red line, fitted line). (B) QQ plot of residuals for impedance measurements (blue dots, data set; linear line, standard normal distribution). (C) RMSE distribution and deviation for skin impedance values (blue dots, predicted value; blue line, Fitted values; blue area, 95% confidence limits).
