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Select layer USA_county and click Edit in the Layer tab or simply double click the layer in
the layers panel to access Layers properties.
Select tab General.
Click on the
In the Column drop down menu select Name_1 attribute on which the classification will
be based on and click Calculate.
You can see calculated expressions that represent the basis for attribute classification.
You can add, remove or change expressions (more info following in the tutorial).
Press Toggle label/expression
button and type the name of the class. For example in
the first class type „Alabama“, in the second class type „Indiana“ and so on. You can
choose whether you want to show expression or label for each of the classes separately
or you can toggle expression for all of them.
Classification by attributes based on continuous values
Classify by attributes based on continuous values (attributes are classified into defined range
classes that represent a set of values):
Select the layer USA_state and click Edit in the Layer tab or simply double click the layer
in the layers panel to access Layers properties.
Select the tab General.
Click on the wizard button.
Choose Continuous values.
In the Column drop down menu select shape_area attribute on which the classification
will be based on.
Number of ranges (classes) set to 5.
Minimum and maximum value will be calculated by default but you can set your own
values. For this example leave it as it is and click Calculate.
Once again you can see calculated expressions:
Click on the expression of the first class and change number 56.2621716 into
5.000000. Change all numbers in all expressions like it is shown in picture below.