Module 13

Question 1

Data-Ink

Answer 1

Non-redundant ink encoding data information

How much of the black pixels that are coloring something in this visualization are actually related to the data vs. something else

Question 2

Data-Ink Ratio

Answer 2

(Data-Ink) / (Total ink used to print the graphic)
= proportion of a graphic’s ink devoted to the non-redundant display of data-info
= 1.0 - (proportion of a graphic that can be erased)

Question 3

Design Principles for Data-Ink

Answer 3

1. Aesthetics and Minimalism
2. Elegance and Simplicity
3. Show the data
   
   • Erase non-data-ink, within reason

Question 4

Interactivity

Answer 4

• Helps users constantly change display of info to answer new questions
• Should offer visualization that offers best view of data moment to moment as desired view changes

Question 5

Information Visualization Tasks

Answer 5

1. Overview => gain an overview of entire collection
2. Zoom => zoom in on items of interest
3. Filter => filter out uninteresting items
4. Details on Demand => select an item or group and get details
5. Relate => view relationships between items
6. History => support undo, replay, progressive refinement
7. Extract => allow extraction of sub-collections through queries

Question 6

Tufte’s 8 Principles of Graphical Excellence

Answer 6

1. Show the data
2. Induce the viewer to think about the substance rather than methodology
3. Avoid distorting what the data have to say
4. Present many numbers in a small space
5. Make large data sets coherent
6. Encourage the eye to compare different pieces of data
7. Reveal data at several levels of detail, from overview to fine structure
8. Serve reasonable clear purpose: description, exploration, tabulation, decoration