Analyzing and Visualizing Data Chapter 6 Data Representation Introducing Visual Encoding Data representation is the act of giving visual form to your data. Viewers: When perceiving a visual display of data, it is decoded using the shapes, sizes, positions and colors to form an understanding Visualizers: Doing the reverse through visual encoding, assigning visual properties to data values Comprised of a combination of two properties Marks: Visible features like dots, lines and areas Attributes: Variations applied to the appearance of marks, such as size, position, or color. Introducing Visual Encoding cont. TBA Introducing Visual Encoding cont. TBA Introducing Visual Encoding cont. TBA Introducing Visual Encoding cont. TBA Introducing Visual Encoding cont. Marks and Attributes are the ingredients, a chart type is the recipe offering a predefined template for displaying data. Different chart types offer different ways of representing data. Introducing Visual Encoding cont. TBA Introducing Visual Encoding cont. TBA Introducing Visual Encoding cont. TBA Introducing Visual Encoding cont. Chart Types TBA Chart Types Exclusions Inclusions Categorical comparisons Dual families Text visualization Dashboard Small multiples A note about ‘storytelling’ Influencing Factors and Considerations TBA Influencing Factors and Considerations cont. TBA Influencing Factors and Considerations cont. TBA Influencing Factors and Considerations cont. TBA Influencing Factors and Considerations cont. TBA Influencing Factors and Considerations cont. TBA Influencing Factors and Considerations cont. TBA Influencing Factors and Considerations cont. TBA Influencing Factors and Considerations cont. TBA Influencing Factors and Considerations cont. TBA Influencing Factors and Considerations cont. TBA Influencing Factors and Considerations cont. TBA Analyzing and Visualizing Data Selecting a Graph Selecting a Graph Pie Charts Compare a certain sector to the total. Useful when there are only two sectors, for example yes/no or queued/finished. Instant understanding of proportions when few sectors are used as dimensions. When you use 10 sectors, or less, the pie chart keeps its visual efficiency. Selecting a Graph cont. Bar Charts/Plots Ordinal and nominal data sets Compare things between different groups or to track changes over time Measure change over time, bar graphs are best when the changes are larger Display and compare the number, frequency or other measure (e.g. mean) for different discrete categories of data Flexible chart type and there are several variations of the standard bar chart including horizontal bar charts, grouped or component charts, and stacked bar charts. Frequency for each category of a categorical variable Relative frequency (%) for each category Select.