Solution 3.6 - Chemometrics: Data Analysis for the Laboratory and Chemical Plant

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  • Published: Jan 1, 2000
  • Channels: Chemometrics & Informatics

1. The scores of the first four PCs (from bottom to top) are plotted against sample time.

2. PC1 shows some evidence of cyclicity because there appear to be a reoccuring pattern, however this is not very clear, probably because the pattern is also influenced by noise.

3. The correlogram is as follows.

4. It appears that there is a cyclicity with a frequency of around 6 datapoints, with maxima at points 7, 13 and 19. This cyclicity is emphasized because correlograms reduce the influence of correlated (non-stationary) noise allow the underlying cyclical trends to become more prominent.

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