GRAPHIC DISPLAYS OF DATA SHOULD
1. Serve a reasonably clear purpose: description, comparison, contextualization.
2. Show the data
3. Cause the viewer to think about what the data mean rather than how the display was made
4. Avoid distorting what the data have to say
5. Encourage the eye to compare different pieces of data
6. Reveal the data at several levels of detail, from fine structure to broad overview
7.Be closely integrated with the statistical base of the data & the verbal descriptions, including the title, of the display
8. Not confuse design variation with data variation
9. Not show more information-carrying dimensions than the number of dimensions in the data
10. Assist in remembering the information
11. Respect the viewer’s intelligence
PRINCIPLES OF GRAPHICAL INTEGRITY
1. Proportional correspondence: The representation of numbers , as physically measured on the surface of the graphic display, should be directly proportional to the numerical quantities represented.
2. Data-ink proportionality: The largest share of the ink should be used to showmeasured quantities (as compared to the ink used for the measurement system).
3. Clear Labeling: Data need clear, detailed, and thorough labeling to eliminate graphical distortion and ambiguity. Write explanations of data on the graphic. Label important events in the data.
4. Contextual relevance: If you do not furnish the context, the viewer will. (if something goes up, something related goes down, etc.)
5. Device Relevance: Suppress vibration grids self-promoting graphics, and expression of data by the use of relevance graphic devices, typographic manipulation, and finesse in the relative weighting of elements.
6. Shape Relevance: Information should not be squeezed into forms that deny its characteristic shape. Being true to information yields its own form.