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Graph Types—579
Graph Types
The following is a description of the basic EViews graph types. We divide these graph types
into three classes: observation graphs that display the values of the data for each observation; analytical graphs that first summarize the data, then display a graphical view of the
summary results; auxiliary graphs, which are not conventional graph types, per se, but
which summarize the raw data and display the results along with an observation graph of
the original data.
The discussion for each type is limited to a basic overview of each graph type and does not
discuss many of the ways in which the graphs may be customized (e.g., adding histograms
to the axes of line graphs or scatterplots;), nor does it describe the many ways in which the
graphs are displayed when using multiple series or categorizations (e.g., stacking; see “Basic
Customization,” beginning on page 558).
Observation Graphs
Observation graphs display the values of the data for each observation in the series or
group. Some observation graphs are used for displaying the data in a single series (Line &
Symbol, Area, Bar, Spike, Dot Plot, Seasonal Graphs), while others combine data from multiple series into a graph (Area Band, Mixed with Lines, Error Bar, High-Low(-Open-Close),
Scatter, XY Line, XY Bar, XY Area, Pie).
Line & Symbol
The line and symbol plot is a simple
plot of the data in the series against
observation identifiers. The plot
shows data values as symbols, lines,
or both symbols and lines.
To display a line and symbol plot for
a single series or for each series in a
group, select View/Graph... from
the series or group menu to bring up
the main Graph Options dialog,
which will automatically open to the
Basic type page. Then choose Line
& Symbol in the Specific listbox.
By default, EViews will display the
data in the series using a line. To illustrate, we use the workfile “Treasury2005c.WF1” containing data on 2005 daily market yields for U.S. Treasury securities at constant maturities.
The default line graph for the 3-month maturity series TB03MTH is depicted. If you look
closely, you may be able to see gaps corresponding to holidays.