Four types of legends can be found:
Defines a legend of a point density based on the value of a certain field.
Labelling field A drop-down menu opens where you can choose fields from the table (Double or Integer types) from which you can make a legend which represents the quantity of each value in the table. The properties of the points which represent the density of the values in the table can be changed.
Point value: This is the numeric value which will be given to each point that is drawn.
This type of legend represents the elements of a layer using a range of colours. The gaps or graduated colours are mainly used to represent numeric data which have progression or range of values, such as population, temperature, etc.
Classification field: A drop-down menu where you can chose the attributes of the layer for which you want to make the classification for. The field must be numerical as it is a gradual classification (by the rank of the value)
Cuantil intervals: The number of intervals are specified and the sample is divided into this number but gathering into groups values according to their order. Number of intervals: Should indicate the rank or interval number which defines their classification.
Represents quantities through the size of a symbol showing relative values.
Represents quantities through the size of the symbol which shows exact values.
Normalisation fields: Possibility of choosing a numerical field which normalises the results, maintaining the proportion of quantities.