From: Simultaneous determination of some antiprotozoal drugs in different combined dosage forms by mean centering of ratio spectra and multivariate calibration with model updating methods
No of updating
samples
DF
METB
RMSEP
%
improvement
1
0.923
1.018
2
0.393
57.42%
0.535
47.45%
3*
0.309
66.52%
0.356
65.03%
4
0.305
66.96%
0.377
62.97%