The scree plot shows the cumulative variance explained by each principal component. You can make decision on the number of components to keep to adequately describe a dataset using ad-hoc rules such as components with a variance > 0.7 or where the cumulative proportion of variation is > 80% or > 90% (Jolliffe 2002)
From the Statistical Reference Guide for Analyse-it 6.24.0: https://analyse-it.com/docs/user-guide/multivariate/scree-plot
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