Fundamentals of Statistics contains material of various lectures and courses of H. Lohninger on statistics, data analysis and chemometrics......click here for more.


Table of Contents Appendix Exercises Mixtures of Wines
See also: PCA, Survey of Exercises 

Exercise
Detection of mixtures of two different wines by PCA

The following exercise shows the effects of mixtures in the PCA plot. Use the data set WINES_TWOBRANDS and use theto perform your experiments.

How to proceed:

  • use the samples "OLO1773" and "ERA2478" and create 9 mixtures with different ratios of both samples (i.e. 10/90 %, 20/80 %, .... of them); therefore,
  • resize the data matrix to make room for an extra 9 rows
  • write a math script to create the mixtures
  • now look at the principal components plot


Additional task: blend several wines (not only two) and check the results in the principal components plot.
 

Last Update: 2005-Jan-25