Institutional Research Information Service
UCL Logo
Please report any queries concerning the funding data grouped in the sections named "Externally Awarded" or "Internally Disbursed" (shown on the profile page) to your Research Finance Administrator. Your can find your Research Finance Administrator at https://www.ucl.ac.uk/finance/research/rs-contacts.php by entering your department
Please report any queries concerning the student data shown on the profile page to:

Email: portico-services@ucl.ac.uk

Help Desk: http://www.ucl.ac.uk/ras/portico/helpdesk
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:
  • Pagination:
    15, 19
  • Journal:
    Spectroscopy Europe
  • Volume:
  • Issue:
  • Status:
  • Print ISSN:
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.
Publication data is maintained in RPS. Visit https://rps.ucl.ac.uk
 More search options
UCL Researchers
Dept of Statistical Science
University College London - Gower Street - London - WC1E 6BT Tel:+44 (0)20 7679 2000

© UCL 1999–2011

Search by