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Population Data at a Glance - Shaded Contour Maps of Demographic Surfaces Over Age & Time (Hardcover)
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Population Data at a Glance - Shaded Contour Maps of Demographic Surfaces Over Age & Time (Hardcover)
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Book & Disk. This volume is an array of demographic data which
can often be pictured in an intelligible and graphically striking
way by a shaded contour map. The data might pertain to population
levels or to rates of fertility, marriage, divorce, migration,
morbidity, or mortality. Most often the data are structured by age
and time (eg: age-specific death rates over time). Shaded contour
maps permit visualisation of such demographic surfaces and offer a
panoramic view impossible to obtain from the usual graphs of levels
or rates at selected ages over time or a selected times over age.
Contour maps are particularly effective in highlighting patterns in
the interaction of age, period, and cohort effects. This monograph
presents a bouquet of shaded contour maps to suggest the broad
potential of their use in population studies. The value of such
maps lies in their substantive import. Graphic designs, E R Tufte
concluded, should give "visual access to the subtle and difficult,
that is, the revelation of the complex". Demographic surfaces can
be particularly complex. A mortality surface, for example, might be
defined over a century of age and a century of time, comprising
10,000 date points that may vary over four orders of magnitude.
Shaded contour maps are an arresting, efficient, and clear means of
giving demographers visual access to such data. William Playfair,
the pioneer of graphic methods for presenting statistical data,
argued that with a good visual display "as much information may be
obtained in five minutes as would require whole days to imprint on
the memory, in a lasting manner, by a table of figures". The 100
shaded contour maps in this monograph summarise more than a half
million data points in a memorable, revealing manner.
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