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| Trellis Display / Small multiples |
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| When do you use horizontal bars vs vertical bars in a bar graph? |
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| When do you use a dot plot? |
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| When analyzing values that are irregularly spaced in time |
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| What makes a radar graph different from a spider chart? |
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| On a radar graph, all axes are different levels of the same variable. On a spider chart, each axis is a different variable. |
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| When do you use a radar graph? |
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| When you want to represent data across the cyclical nature of time. |
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| When would you use an animated scatterplot? |
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| When you want to see how two quantitative variables change over time |
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| What angle (in degrees) are people best able to interpret sloped data in a line graph? |
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| What type of y-axis scale (other than normal, linear) could be used to show changes in rate? |
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| What is the difference between a crosstab and a scatterplot matrix? |
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The scatterplot matrix usually has every variable listed on each axis, so each bivariate relationship is actually shown twice.: A1 A2
A1
A2
Crosstabs do not have that redundancy.
B1 B2 B3
A1
A2
A4 |
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| Multiple Concurrent views |
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| How many variables is hypervariate data? |
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| A graphical object that represents a data case. A mark tha can be varied in N ways |
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| Name 3 ways to display hypervariate data |
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(Non-exhaustive)
Excel sheet
star charts
chernoff faces
small multiples
scatterplot matrix (with size and color encodings)
glyphs
table lens
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| How does viz amplify cognition? |
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Increases memory and processing resources available
Reduces search for information
Enhances pattern recognition
Enables perceptual inference
Encodes info into manipulable medium |
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| Study of symbols and how they convey meaning |
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| Applying physics to measuring human perceptual systems |
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| What are the two stages of visual perception? |
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Early, pre-attentive, parallel
Sequential, goal-directed |
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| What are the six Gestalt principles? |
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Symmetry
Continuity
Proximity
Similarity
Common fate
Closure |
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| Difference between luminance and brightness |
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Luminance is measured amount of light
Brightness is perceived amount of light |
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| 3 dimensions of color in HVS model |
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Hue (color)
Value (brightness)
Saturation (lightness/darkness) |
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| Max. recommended number of diffrent colors used to encode categories of info |
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| Should you use a rainbow color scale to do ____. |
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| Probably not! Dr B says NO |
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| Should you use blue in large areas or thin lines? (Pick one) |
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| Should you use red and green in the central field of view or the periphery? |
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| For large regions, should you use saturated or unsaturated colors? |
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| What is the best visual encoding to use for any type of data (quantitative, nominal, ordinal)? |
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| Are people better at comparing different areas or different volumes? |
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| Is color hue best for encoding quantitative, ordinal, or nominal data? |
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| Calendar events on a timeline |
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| What is the degree of a vertex? |
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| The number of edges connected to it |
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| How is a tree different from a more general graph? |
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Definition
Edges are directed
No cycles
Specially designated "root" vertex |
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| What are three challenges in graph visualization? |
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Layout/positioning
Change in focus/Naviation/Interaction
Scale |
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| Name 5 ways network nodes can be encoded |
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Size
Shape
Color/Texture
Location
Label |
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| Name 4 ways network edges can be encoded |
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| Name the 6 aesthetic considerations of network graphs |
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Minimize crossings
Minimize longest edge
Make all edge lengths the same
Minimize total edge length
Minimize area
Minimize total bends |
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| What is network visualization nirvana? |
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Definition
Every node visible
Degree of node easily countable
Follow every link from source to destination
Clusters and outliers are visible |
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