Use of double windowing, variable selection, variable ranking and resolvability indices in window factor analysis
✍ Scribed by Richard G. Brereton; Abdallah K. Elbergali
- Publisher
- John Wiley and Sons
- Year
- 1994
- Tongue
- English
- Weight
- 661 KB
- Volume
- 8
- Category
- Article
- ISSN
- 0886-9383
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✦ Synopsis
A method for selecting variables in the non-sequential direction of a two-way data matrix (e.g. wavelength in diode array HPLC) is described. Composition 1 and 2 resolvability indices are calculated according to the size of eigenvalues of uncentred data matrices as a window is moved along the sequential direction. A double-window technique is then performed where resolvability indices are calculated as a window is moved along the non-sequential direction. Some regions have higher resolvability indices and hence are more useful for resolution. Variables are ranked according to resolvability. Two simulations are analysed and it is shown that it is possible to obtain good resolution on a small subset of the original variables.