Agriculture Reference
In-Depth Information
0
100
200
0
10
20
30
200
Field
yield per
plot (150 sq. ft.)
0
200
Dry weight
(after 24 hr
heat curing)
100
0
150
100
Jumbos:
≥3 in.
50
0
30
20
Mediums:
≥2 & <3 in.
10
0
0
200
0
50
100
150
Figure 9.9
Scatter plot matrix of onion yield components.
Again using the Large Onion Dataset 2001-02, enter the following
command and see the results:
graph matrix yield drywts jumbo mediums
In this scatter plot matrix, it is easy to see some fairly strong rela-
tionships between field yield (weights immediately after harvest) and
dry weights (weights after 24 hours of heat curing). This would be
expected because the dry weights are just slightly less than the field
weights. There also appears to be a relationship between yield and
jumbo (≥3 in.) onions, but not much of a relationship between yield
and mediums (≥2 and <3 in.).
There are several other graph types to choose from under the
Graphics menu. Many of these are used for specific statistical anal-
yses. For example, Regression diagnostics plots are used to evalu-
ate regression analysis and are covered in Chapter 10 (Correlation
and Regression).
The table of graphs under the Graphics menu is used to combine
one or more graphs into a single file. This can be helpful when sev-
eral graphs are related in some fashion and together they enhance the
presentation. This feature also can help relating two different graphs
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