Principal component analysis Principal-component analysis 29 principal component analysis 20 Quality control 13 China 10 Cluster analysis 10 human 9 Article 7 Climate change 7 Forecasting 7 Humans 7 Multivariant analysis 7 Spectrum analysis 7 Support vector machines 7 Decision trees 6 Ecosystems 6 Eigenvalues and eigenfunctions 6 Factor analysis 6 Indicator indicator 6 Principal Component Analysis 6 Principal Components 6 Regression analysis 6 Classification (of information) 5 Diagnosis 5 Digital storage 5 Dimensionality reduction 5 Discriminant analysis 5 Ecology 5 Fault detection 5 Learning algorithms 5