Data on three proportions, probabilities, or fractions that add to 1 can be projected from a simplex to the plane and represented in a two-dimensional plot, commonly known as trilinear, triaxial, triangular, etc. The Stata program triplot has been available for some years as one way to produce such plots. In this talk, I preview a new version of this program together with a variety of other plots based on transformations of the underlying variables.
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