MIS 6380 Lecture 13
Map of the Market Functionality
-Area is allocated by market capitalization -Organized by industry sectors of market -Weight of lines defines sectors versus company -Color highlights advancing or declining share price -Color assigned based on % change of share price -Labels defined as company name and ticker symbol -Labels were eventually removed
Treemap Structure
-Converts array of numbers into a space filling map -Size of components are a ratio of set member values -Space is allocated to based on ratios -Space is allocated to named categories in the set -Ideal for representing large amount of values of a whole
Organization Chart
-Hierarchy relationship of classes only -Does not provide percentage contribution -Less effective for large data sets
Exploratory Heatmap
-Identify largest revenue with size of blocks -Encodes profitability with a heatmap color -Identifies best profitability with darkest green -Identifies product groups with troubled profitability
Adding the Whole
-Moving from tree to a treemap provides the whole -Treemaps helps us understand percentage contributions -Percentages defined at each level of hierarchy
Hierarchical Visualization
-Ordered sets and subsets -Elements organized in relationship to each other -Elements organized in relationship to whole (100%) -Dynamic multiple tiered pie chart
Edward Tufte's Critique
-Preference for a supertable -Preference for sparklines (pattern over time) -Need labels for each stock -Overweight of recent results - Recency Bias
Summary
-Several different types of hierarchical visualizations -Tree or Node-link provides relationship -Tree map provides relationship and percentage of the whole -Tree map provides percentage of whole and comparison
Voronoi Treemap
-Shows average consumer spending in different categories -Represents major categories for spending (split between thick grey lines) Functionalities: -Space allocation based percentage of spending -Major blocks defined by spending categories -Minor blocks defined by spending subcategories -Weight of line defines categories versus subcategories -Color encodes amount of percentage price increase Tooltips encode -Spending category -Percentage share of spend in category -Annual Percentage change in price
P & G Heatmap Functionality
-Space Allocation is based on corporate revenue -Major blocks defined by country/market -Minor blocks defined by product category -Color heat map index defined by market share
Newsmap Functionality
-Space allocation based on number of related stories -Rectangular versus square categories -Uses a feed from Google news -Filtering (by country or major news subject) -Drill down into a single story
Wattenberg Response to Tufte
-Super user are using it at a high rate of speed -Weather report for stock market -Objective is "glanceability" -Labels were removed to avoid interference -Expert users known the layout like familiar geo map
Taxonomy of Hierarchy Systems
Cartesian Systems: -Node link layouts (parent to child), Indented Layout (table of contents), cone-tree. -Icicle Tree: relationship between set and subset -Tree Map: Where all sets will come together to add up to the 100% Polar Systems: -Node-link radial layout -Radial Icicle or Sunburst Other Geometries: -3D hyperbolic Tree (create a hierarchy system/model) -Vonoroi Treemap: Uses algorithm to make sizes of the different categories within the other categories
finviz
Financial visualization. -Tree map may show news filters, finances, and etc.
Exploratory Analysis
For a tree map, can see which categories are doing the best and which are doing the worst
Martin Wattenberg's Application
Solved problem of high aspect ratio comparison -Fixed Schneiderman's treemap problem -Now able to compare the small rectangles to the large ones
Ben Schneiderman's Treemap
The origin of the treemap -Solved problem of space allocation of computer files on a storage drive -Proportionally spaced and layed out on the file size