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 31



Figure 32Map 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 33Equal 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:

F ORM  ULAS  ...
(3)

The other types 1 to 7 and 9 can be found in the paper



Figure 34Map 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 35Quantile 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 36Map 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 37Jenks 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 38Map 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 39Variable Breaks Settings Dialog