Determination of Cefoperazone Sodium in Presence of Related Impurities by Improved Classical Least Squares Chemometric Methods: A Comparative Study

Figure 3

Two-dimensional scores plot for the mean centered 16 training set samples (circles) and the 9 test set samples (stars) of concentration matrices of the 4-level 3-factor experimental design, with % variance of 99.7% for first PC and 0.28% for second PC.