Re to: # 1 I'm
learning to use the technique at the moment (
spatial relations for lakes and water chemistry in Sweden), there are so many ways to do and use PCA and FA so I guess it will take some time to nail it... the two books I found most helpful in the start for multivariate techniques are: Applied Multivariate Methods for Data Analysts, Dallas E. Johnson AND APPLIED MULTIVARIATE TECHNIQUES, SUBHASH SHARMA.