SPSS® 12.0 Command Syntax Reference

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MAPS
Example
Overview
MAPS /GVAR = VAR(country)
/GSET = ’World Countries’ LAYER =’World’
/TITLE = ""
/ROVMAP=VAR(populatn)
SUM=(SUM) DISTRIBUTION = EQCOUNT .
Each occurrence of the MAPS command produces a single map displaying from one to six
themes (bars, pies, dot densities, symbols, and shadings for ranges or individual values) that
illustrate the distribution of data across the geographic regions displayed on the map. The
map boundaries and geographic features, such as highways and city locations, come from a
set of tables known as a geoset. The values of a geographic variable in the SPSS data must
match values of a key field in a geoset in order to place the thematic elements in the right
geographic regions.
Note: Region is used throughout this document to refer to any geographic unit. In fact, most
themes can be applied to points, such as cities or office locations, and to lines, such as highways,
as well as to areas with boundaries, such as countries.
Basic Specification
The basic specification has three required parts:
• The name of a geoset.
• The name of the geographic variable whose values correspond to those of a table in the
geoset. (See the XY subcommand for an alternative.)
• A theme subcommand that includes the variable on which descriptive statistics are to be
calculated for each region.
Syntax Rules
• One and only one of the GVAR, XY, or LOOKUP subcommands is required to specify the
SPSS variable to be matched with a table in the geoset. XY and LOOKUP also provide information
to create a new layer.
• The GSET subcommand is required.
• At least one of the theme subcommands (ROVMAP, SYMBOLMAP, DOTMAP, IVMAP,
BARMAP, or PIEMAP) is required. Each of these can be entered once and only once.
• The GVAR (or XY or LOOKUP), GSET, LAYER, LOOK, SHOWLABEL, TITLE, and
GVMISMATCH subcommands can be entered in any order but must precede the theme subcommands.