Chemistry
Understanding How Principal Component Analysis Interprets Spectral Data
Quick fact
PCA can reduce a spectrum with 1000 wavelengths to just two or three 'score' values that still capture 90% of the variation between samples, making it possible to visually cluster samples with similar chemical features.
Why this is interesting
Imagine a spectrum with hundreds of wavelengths—how do you see the important patterns in all that noise? PCA turns that data cloud into a clear, simple picture.