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Graphics in Documents Using Graphics to Think Preparing the graphics first helps you get started and sets out the framework of your written product Graphical Display and Scientific Inquiry “ . . .the way in which we present the data determines what can be seen in the data.”

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in documents

Graphics

in Documents

using graphics to think
Using Graphics to Think

Preparing the graphics first helps you get started and sets out the framework of your written product

graphical display and scientific inquiry
Graphical Display and Scientific Inquiry
  • “ . . .the way in which we present the data determines what can be seen in the data.”
      • Valiela, Doing Science, p. 183
  • Choice of graphical display can reveal new relationships among data.
    • representing the data differently can lead to new findings
in 1854 dr john snow made a map of deaths from the cholera epidemic in london
In 1854, Dr. John Snow made a map of deaths from the cholera epidemicin London.

Example: Spatial representation of data

Previously, data on deaths had been displayed chronologically.

Tufte, Visual Explanations, 1997

slide5

Work House

Brewery

graphical display
Graphical Display
  • Snow took data normally displayed chronologically (x # of deaths each day throughout the epidemic) and graphed it spatially,
  • Spatial display convinced the authorities to shut down the Broad St. pump. From that moment, cholera seriously understood to be linked to bad water.
lessons
Lessons
  • Map makes quantitative comparisons visible and locates them spatially.
  • Map is appropriate context for showing cause and effect.
  • Time series chart not as effective.
  • Thinking about howbest to display the data will help you establish useful relationships among the data.
graphics in written documents two important questions
Graphics in Written Documents: Two Important Questions
  • When are graphics appropriate?
    • What can information display do that words alone cannot?
  • What makes a good graphic?
    • Are there relevant principles of design?
    • See works of William S. Cleveland and Edward R. Tufte
when are graphics appropriate
When are graphics appropriate?
  • To show complex data in a simplified form
    • show a lot of data in one place
  • To emphasize relationship better than can words alone
  • To help the reader remember
  • To allow parallel processing of information (visual and verbal)
deciding how to present data
Deciding How to Present Data
  • William Cleveland studied how accurately readers evaluate graphical cues. Rank of cues from most to least accurate perception:
      • Position along an axis
      • Length
      • Angle or slope
      • Area
      • Volume
      • Color and shade
  • Use cues that are ranked as high as possible.

William Cleveland, The Elements of Graphing Data, 1994

principles of information display
Principles of Information Display
  • Read the works of Edward Tufte.
    • The Visual Display of Quantitative Information, 1983
    • Envisioning Information, 1990
    • Visual Explanations, 1997
  • Tufte analyzes visuals displays of data to see which ones help the reader/viewer think through the problem or understand the results.
    • See article on PowerPoint in Reference list

Link

charles j minard s 1861 graphic depicts napoleon s russian campaign of 1812 tufte visual display
Charles J. Minard’s 1861 graphic depicts Napoleon’s Russian Campaign of 1812 (Tufte, Visual Display)
tufte calls minard s graphic possibly the best ever constructed
Tufte calls Minard’s graphic “possibly the best ever constructed.”
  • Six variables are plotted:
    • size of army
    • location (latitude)
    • location (longitude)
    • direction
    • temperature
    • time (dates)
slide16

Column

Position (X)

0 cm

Air Sampling

Points

Bioreactor Packing

25 cm

50 cm

75 cm

100 cm (Air Outlet)

Contaminated

Air Inlet

Figure 5.2. Schematic of the experimental bioreactor

principles of design
Principles of Design
  • Keep every graphic as simple and

uncluttered as the complexity of your

data allows.

  • Beware the default parameters in Excel!
guidelines for labeling
Guidelines for Labeling
  • Labels are a frame . . . of reference, of orientation.
  • Label each graphic clearly with a figure or table number and a title.
    • Place the figure number and title beneath a figure (graph, chart, etc.).
    • Place the table number and title

above a table.

correct placement of figure title
Correct Placement of Figure Title

Figure 3. Relationship between density and temperature of air at standard atmospheric pressure. Source of data: Engineering Fluid Mechanics, 2001

slide24

Correct Placement of Table Title

Table 2: Example of Table with Modified Parameters

more labeling guidelines
More Labeling Guidelines
  • Label both axes. These labels are NOT optional.
  • Create a title (or a title and a caption) that draws attention to significant aspects of the graphic.
    • Give significant details either on the figure itself or in parentheses (or smaller type) after the title/caption.
      • Significant details could be experimental details (such as time of day readings taken) or source information.
integrate graphics with your text
Integrate graphics with your text.
  • In the body of the document, make sure you do the following:
    • Describe everything graphed. For tables, explain column headings, at least.
    • Draw attention to important features of data. Try to include them in title too.
    • Describe conclusions drawn from the data. What’s significant about those data or findings?
  • Place graphic close to its discussion.
slide27

Coefficient of Thermal Expansion/Shrinkage

A low coefficient of thermal expansion indicates that the material will have minimal change in length given temperature fluctuations. Thermal coefficients for the patching materials are summarized in Table 4; as can be seen, FRP overlay has the lowest.

Table 4. Coefficients of Thermal Expansion/Shrinkage for Patching Materials

captions integrate graphics with text
Captions integrate graphics with text.
  • Cleveland advocates using captions and says they should make three contributions to understanding:
    • Describe everything graphed or illustrated
    • Draw attention to important features of data
    • Describe conclusions drawn from the data.
  • Captions are not conventional in many fields.
  • At least make title more than “X vs Y.”
slide29

Figure 2. Destruction of Organic Contaminants by Phytodegradation

Enzymes in plant roots break down (degrade) organic contaminants. The fragments are incorporated into new plant material.

slide31

Figure 2. United States Facilities with No. 2 Emissions

Source: Environmental Protection Agency, 2000, www.epa.gov/airs/mapview.htm

correct labeling cite source of data
Correct Labeling: Cite source of data

Figure 3. Relationship between density and temperature of air at standard atmospheric pressure. Source of data: Crowe, et al. Engineering Fluid Mechanics, 2001