Ambroxol HCl Ambroxol HCl degradate Guaifenesin Guaicol
Validation parameters PLS PCR PLS PCR PLS PCR PLS PCR
(a) Predicted vs. known concentration              
1- Slope 0.9795 0.9846 1.0282 1.0276 0.9935 1.0029 0.8840 0.9064
2- Intercept 0.1793 0.1374 -0.0917 -0.0886 0.4375 -0.0034 1.1865 0.9861
3- Correlation coefficient (r) 0.9988 0.9989 0.9991 0.9988 0.9987 0.9980 0.9988 0.9994
(b) Residual vs. actual concentration 0.141 0.144 0.123 0.127 1.005 1.184 0.497 0.525
± error in prediction                
(c) RMSEP 0.031 0.025 0.019 0.020 0.251 0.117 0.085 0.095
Table 3: Summary of results obtained by applying the diagnostic tools for model validation of the chemometric methods.