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Table 4 RMSEP and percentage recoveries of the updated PLS model at different number of updating samples

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
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%
  1. * The optimum number of updating samples needed