The Scatter 2D Density plot is useful for plotting two vectors against each other when the vectors contain large amounts of values that are overlapping. The difference between this plot and the regular Scatter 2D plot is that the objects are colored by density, which means that the more tightly the objects are grouped the higher the color temperature will be. The default object size is also smaller compared to the regular plot.

Scatter 2D density settings:

Data range: Specifies which vectors that are plotted against each other on X and Y.

Color: Changes the coloring of the scatter 2D objects. Available options are [FIXED]; the same color is used for all objects, [INDEX]; the indices for the plotted vectors are used for the coloring, [VALUE]; the values of the selected vectors are used for the coloring, [CATEGORY]; Depending on the type of the plotted vectors, either an observation category or a variable category is used for the coloring, [DENSITY]; the coloring is based on the density of the plotted objects, i.e. how tightly they are grouped together. Coloring by [DENSITY] is the default setting.

Size: Changes the sizes of the plotted objects. Available options are [FIXED]; all objects have the same size, [INDEX]; the objects are sized according to the indices of the selected vector, [VALUE]; the objects are sized according to the values of the selected vector, [CATEGORY]; the objects are size according to either an observation category or a variable category.

Shape: Changes the shapes of the plotted objects. Available options are [FIXED]; all objects have the same shape, [CATEGORY]; the shapes of the objects are changed according to which category they belong to.

Label: Changes the labeling of the plotted objects. Available options are [NONE]; no labels are used, [INDEX]; the indices of the selected vector are used as labels, [IDENTIFIER]; An identifier of the plotted objects is used as labels, [VALUE]; the values of the selected vector are used as labels, [CATEGORY]; depending on the type of plotted vectors, either an observation category or a variable category is used for the labeling.

Lines: Draws lines between the objects in the scatter 2D plot. Available options are [NONE]; no lines are drawn, [INDEX]; the order of the drawn lines is based on the indices of the plotted objects, [VALUE]; the order of the lines that are drawn is based on the values of the selected vector.

Statistics: Available options are [NONE] and [HOTELLING]. When [HOTELLING] is selected, a hotelling ellipse is drawn in the scatter 2D plot. Statistically, 95% of the plotted objects lie inside the ellipse. The hotelling ellipse can be used to detect outliers that lie outside the ellipse.

Comment: Options available are [NONE], [CUSTOM] and [CATEGORY]. With [CUSTOM] the user can enter a custom comment using the advanced settings. The custom comment will be shown in the tooltip box that appears when the mouse pointer hovers above a data point. The comment is also shown in any text box created from the table toolbar. When [CATEGORY] is selected then the comment will contain either an observation category or a variable category depending on the type of the plotted vectors.