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374—Chapter 12. Groups

Here is an example of a table after freezing and editing:

 

 

 

1995

 

1995

Gross Domestic Product

1792.3

1802.4

1825.3

1845.5

1816.4

One-period % change

1.03

0.56

1.27

1.11

4.58

Price Level

1.07

1.07

1.08

1.09

1.08

One-period % change

0.80

0.49

0.52

0.55

2.55

 

 

 

1996

 

1996

Gross Domestic Product

1866.9

1902.0

1919.1

1948.2

1909.0

One-period % change

1.16

1.88

0.90

1.52

5.10

Price Level

1.09

1.10

1.11

1.11

1.10

One-period % change

0.72

0.41

0.64

0.46

2.27

Graphs

These views display the series in the group in various graphical forms. You can create graph objects by freezing these views. Chapter 14, “Graphs, Tables, and Text Objects”, on page 415 explains how to edit and modify graph objects in EViews.

The Graph views display all series in a single graph. To display each series in a separate graph, see “Multiple Graphs” on page 376.

Line, Area, Bar and Spike Graphs

Displays a line, area, bar or spike graph of the series in the group. Click anywhere in the background of the graph to modify the scaling options or line patterns.

Scatter

There are five variations on the scatter diagram view of a series.

Simple Scatter plots a scatter diagram with the first series on the horizontal axis and the remaining series on the vertical axis.

The remaining three options, Scatter with Regression, Scatter

with Nearest Neighbor Fit, and Scatter with Kernel Fit, plot fitted lines of the first series against the second on top of the scatter diagram. They differ in how the fitted lines are calculated. All three graph views are described in detail in “Scatter Diagrams with Fit Lines” beginning on page 400.

XY Pairs produces scatterplots of the first series in the group against the second, the third series against the fourth, and so forth.

Graphs—375

XY Line

These views plot XY line graphs of the series in the group. They are similar to the scatterplot graphs, but with successive observations connected by lines. One X against all Y’s will plot the first series in the group against all other series in the group. XY pairs will produce XY plots for successive pairs of series in the group.

Once you have constructed the XY plot, you may elect to display symbols only (similar to a scatterplot), or lines and symbols for each XY graph. Click anywhere in the background of the view and change

the line attributes for the selected line from Lines only to Symbol only or Line & Symbol.

See Chapter 14, “Graphs, Tables, and Text Objects”, on page 415 for additional details on graph customization.

Error Bar

The Error Bar view plots error bars using the first two or three series in the group. The first series is used for the “high” value and the second series is the “low” value. The high and low values are connected with a vertical line. The (optional) third series is plotted as a small circle.

Note that EViews does not check the values of your high and low data for consistency. If the high value is below the low value, EViews will draw “outside halflines” that do not connect.

This view is commonly used to display confidence intervals for a statistic.

High-Low (Open-Close)

This view plots the first two to four series in the group as a high-low (open-close) chart. As the name

suggests, this chart is commonly used by financial analysts to plot the daily high, low, opening and closing values of stock prices.

The first series in your group should be used to represent the “high” value and the second series should be the “low” value. The high and low values are connected with a vertical line. EViews will not check the values of your high and low data for consistency. If the

376—Chapter 12. Groups

high value is below the low value, EViews will draw “outside half-lines” that do not connect.

The third and fourth series are optional. If you provide only three series, the third series will be used as the “close” value in a high-low- close graph. The third series will be plotted as a right-facing horizontal line representing the “close” value.

If you provide four series,

the third series will represent the “open” value and will be plotted as a left-facing horizontal line. The fourth series will be used to represent the “close” value. The close value will be plotted as a right-facing horizontal line.

Pie

This view displays each observation as a pie chart, where the percentage of each series in the group is shown as a wedge in the pie.

If a series has a negative or missing value, the series will simply be dropped from the pie for that observation. You can label the observation number to each pie; double click in the background of the pie chart and mark the Label Pie option in the Graph Options dialog.

Multiple Graphs

While Graph views display all series in a single graph, Multiple Graphs views display a separate graph for each series in the group.

Line, Area, Bar and Spike Graphs

These views display a separate line, area, or bar graph for each series in the group.

Scatter

First series against all

This view displays scatter plots with the first series in the group on the horizontal axis and the remaining series on the vertical axis, each in a separate graph. If there are G series in the group, G − 1 scatter plots will be displayed.

Multiple Graphs—377

Matrix of all pairs (SCATMAT)

This view displays the scatterplot matrix, where scatter plots for all possible pairs of series in the group are displayed as a matrix. The important feature of the scatterplot matrix is that the scatter plots are arranged in such a way that plots in the same column share a common horizontal scale, while plots in the same row share a common vertical scale.

If there are G series in the group, G2 scatter plots will be displayed. The G plots on the main diagonal all lie on a 45 degree line, showing the distribution of the corresponding series on the 45 degree line. The G( G − 1 ) ⁄ 2 scatters below and above the main diagonal are the same; they are repeated so that we can scan the plots both across the rows and across the columns.

10

5

0

-5

-10

25

20

15

10

5

0

100

80

60

40

20

0

800

600

400

200

0

-10

log(Body Weight)

Total Sleeping Time

Maximum Life Span

Gestation Time

-5

0

5

10

0

5

10

15

20

25

0

20

40

60

80

100

0

200

400

600

800

Here is a scatter plot matrix that we copy-and-pasted directly into our document. Note that the resolution of the scatter plot matrix deteriorates quickly as the number of series in the group increases. You may want to freeze the view and modify the graph by moving the axis labels into the scatters on the main diagonal. You can also save more space by moving

378—Chapter 12. Groups

each scatter close to each other. Set the vertical and horizontal spacing by right-clicking and choosing the Position and align graphs... option.

XY line

This view plots the XY line graph of the first series on the horizontal X-axis and each of the remaining series on the vertical Y-axis in separate graphs. See the XY line view for Graph for more information on XY line graphs. If there are G series in the group, G − 1 XY line graphs will be displayed.

Distribution Graphs

CDF-Survivor-Quantile

This view displays the empirical cumulative distribution functions (CDF), survivor functions, and quantiles of each series in the group. These are identical to the series CDF-Sur- vivor-Quantile view; see “CDF-Survivor-Quantile” on page 391 for a detailed description of how these graphs are computed and the available options.

Quantile-Quantile

This view plots the quantiles of each series against the quantiles of a specified distribution or the empirical quantiles of another series. QQ-plots are explained in detail in “QuantileQuantile” on page 393.

One useful application of group QQ-plots is to form a group of simulated series from different distributions and plot them against the quantiles of the series of interest. This way you can view, at a glance, the QQ-plots against various distributions. Suppose you want to know the distribution of the series SLEEP2. First, create a group containing random draws from the candidate distributions. For example,

group dist @rnorm @rtdist(5) @rextreme @rlogit @rnd

creates a group named DIST that contains simulated random draws from the standard normal, a t-distribution with 5 degrees of freedom, extreme value, logistic, and uniform distributions. Open the group DIST, choose View/Multiple Graphs/Distribution Graphs/ Quantile-Quantile, select the Series or Group option and type in the name of the series SLEEP2 in the field of the QQ Plot dialog box.

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