Principal Components Analysis - UC Davis Plant Sciences
Apr 27, 2004 ... Two case-studies on the application of Principal component analysis. Applied
Statistics, 16:225-236) applied PCA to a sample of 40 winged ... as many
degrees of freedom as variables considered in the PCA. This test is very sensitive
, so it is recommended that a very low be used (e.g. 0.001 or 0.0005).