Thinking about Graphics Scales in Stata. Level of measurement Categorical versus continuous Categorical data may be represented as Position along a categorical.

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Presentation transcript:

Thinking about Graphics Scales in Stata

Level of measurement Categorical versus continuous Categorical data may be represented as Position along a categorical axis Aesthetics such as color, marker type Paneling Continuous data may be represented as Position along a continuous axis Aesthetics such as color, marker size

Categories as axes

Categories as aesthetics

Bivariate category axes & aesthetics

Bivariate category paneling

Univariate continuous axis

Bivariate continuous axes

Summary (continuous) by category

Scatter by category

Coordinates Systems Cartesian, mostly Polar, for pie Dimension 2 to 4, as an overlay Order Category order Continuous order, forward or reversed Measurement units Linear, the usual Log

Cartesian and polar

Layering

Layering, continuous

Layered, categorical

Order, categorical

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