PowerPoint Presentation - Dimension reduction in large data sets

SST example

•Explain the dark/light red/blue shading

•Compared to the PCs

–Rotation (using varimax) gives separate regions in the first 2 PCs, rather than overall temperature and a contrast between regions

–SCoTLASS gives a simpler version of the rotated PCs

–SCoT (a technique that maximises a criterion combining variance and simplicity) gives a simpler version of the unrotated PCs; so do simple components, but simplicity in a different sense

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