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This chapter describes different types of data that the reader is likely to encounter. It illustrates methods of summarising and displaying categorical data (bar charts, pie chart). It describes the different ways of summarising continuous data by measures of location or central tendency (mean, median, mode) and measures of spread or variability (range, variance, standard deviation, inter‐quartile range). It also illustrates how to display continuous data (dot‐plots, histograms, box‐and‐whisker plots).