Often we are interested in viewing the actual data/observations associated
with points in our plots. The Tools menu provides many options and
operations for visualising our data. In particular it provides access
to a number of GGobi plugins. Some basic information about plugins is
available from the Help menu, selecting the About Plugins item. The
actual plugin we are interested in is the Data Viewer. Selecting this
item from the Tools menu will display a textual view of the data,
showing the row numbers and the column names, and allowing us to sort
the rows by clicking on particular column names.
To make most use of the Data Viewer we will want to use the Identify
option available under the Interaction menu. This will change the
Control window to display the Identify controls as shown here. The
Data Viewer is then linked to the Plot, allowing us to select a
particular row in the Data Viewer to have the corresponding observation
identified in the current Plot. Similarly, we can mouse over the Plot
to have the individual points identified (with their row number) as
well as displaying to the observation within the Data Viewer. Within the
Plot display we can also right mouse button a point to have it's row
number remain within the plot (useful when printing to highlight
particular points). The right mouse button on the same point will
remove the row number display.
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