11.10 Defining Breaks for the Classification of Data
To classify different methods
to classify data have been implemented. These methods are
Break values can be calculated by adding the information reader and executing it.
The number of classes can be defined by double clickig on the information reader
within the file tree to open the settings dialog. After execution the map
applying the classification as specified can be viewed within the right window.
Drag and drop the information reader into the right window (see display
options and map settings for further details). The original values are not
changed within the dataset. If you wish to substitute the original values
with the class numbers you have to apply the specific Opton File Changer
Function.
11.10.1 Equal Breaks
Equal breaks devides all values in classes with equally
sized intervals, e.g. 0 to 5, 5 to 10, 10 to 15 etc.
Figure 32  Map displayed with Equal Breaks 

The function has the following dependencies:
Equal Breaks Settings Dialog Define the number of classes you want to calculate the
breaks for.
Figure 33  Equal Breaks Settings Dialog 

Find more information about the function at the section
Equal Breaks.
11.10.2 Quantile Breaks
Quantile breaks devides all values in classes with an
equal number of units. There are 9 different mathematical formula implemented to
define quantile breaks values that have been presented by REFERENZ TODO. The
default type is No. 8. The formulas are:
The other types 1 to 7 and 9 can be found in the paper
Figure 34  Map displayed with Quantile Breaks 

The Quantile Breaks function has the following dependencies:
Quantile Breaks Settings Dialog Define the number of classes you want to calculate
the breaks for. Select the type of formula you wish to use to calculate the breaks.
Find more information about the different types at the section Quantile
Breaks
Figure 35  Quantile Breaks Settings Dialog 

11.10.3 Jenks Optimal Breaks
Jenks Optimal Breaks devides all values in classes applying an algorithm minimizing
the differences within each class and maximizing the differences between each
class.
The Jenks Breaks function has the following dependencies:
Figure 36  Map displayed with Jenks Breaks 

Jenks Optimal Breaks Settings Dialog Define the number of classes you want to
calculate the breaks for. Find more information about the different types at the
section Jenks Breaks.
Figure 37  Jenks Breaks Settings Dialog 

11.10.4 Variable Breaks
Within the variable breaks function customized break
values can be defined to classify all values. The breaks can be defined in the settings
dialog by typing the value or by clicking at the the historgram.
The Variable Breaks function has the following dependencies:
Figure 38  Map displayed with variable breaks 

Variable Breaks Settings Dialog Define the number of classes you want to calculate
the breaks for by adding or deleting classes through the add button. Define the
breaks by clicking at the specific value in the distribution chart or by typing in the
value. Find more information about the different types at the section Variable
Breaks
Figure 39  Variable Breaks Settings Dialog 
