Graphical Summaries
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.. toctree::
   :maxdepth: 1

   lectures/2-1-understanding-the-structure-of-data-set
   lectures/2-2-tools-for-categorical-qualitative-data
   lectures/2-3-tools-for-numerical-quantitative-data
   lectures/2-4-exploring-quantitative-distributions-modality-shape-and-outliers