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Publication Detail
Back to basics: Multivariate qualitative analysis, "SIMCA"
  • Publication Type:
    Journal article
  • Publication Sub Type:
    Journal Article
  • Authors:
    Davies AMC, Fearn T
  • Publication date:
    01/12/2008
  • Pagination:
    15, 19
  • Journal:
    Spectroscopy Europe
  • Volume:
    20
  • Issue:
    6
  • Status:
    Published
  • Print ISSN:
    0966-0941
Abstract
Soft Independent Modeling of Class Analogies (SIMCA) makes separate PCA models for each group. Each group has its own PC space which is normally modeled with only a few PCs. Because SIMCA uses different PC models for each group, there is no general plot which can be used for looking at all groups in a single plot. There are two plots which can be used for assessing SIMCA results. The Coomans Plot compares the distance to the model results in pairwise plots. Both of these plots can have limits also plotted to help decide if a sample could be a member of the group. The Coomans' plots 3b, 3d and 3f indicate that the heather samples do not constitute a well formed group. The Coomans' plot indicate that rape is well classified group but many other honeys are incorrectly classified as rape. It is observed that acacia and rape can be reliably classified but there is considerable overlap with heather and chestnut samples.
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