Factor-analysis methods: re-reading regimes in the data space

PCA and MCA on the sandbox — duality scheme, factor axes and inertia

Mind map of chapter 24: from the preferential side (ch. 20-23) to the descriptive side. Row/column duality scheme, PCA (axis 1 captures 84.87% of inertia, plane 1-2 = 96.36%, R/T/F↓/Tr/S/V/C cluster aligned, Dr opposed), MCA (relative profiles and χ² distance, barycentric principle), gains and limits of factor analysis.