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Table 3 The number of components to truncate according to the different truncation methods: the evaluation of a scree plot with visual localisation of the inflection point ("Scree plot method for truncation of principal components" section), the approach of Gavish and Donoho ("Analytical model-based methods for truncating principal components" section) and the anisotropy method ("Anisotropy method for truncation of principal components" section) with using the projected histograms and the anisotropy threshold of 0.5

From: Optimal principal component analysis of STEM XEDS spectrum images

Dataset Scree plot Gavish and Donoho Anisotropy
Synthetic 6–8 30 7
Experimental 6–8 7 7