Biplots are statistical graphics that represent in the same plane both the variables and the cases. Usually variables are represented by arrows, while points represent cases. See the example in 1.
A Biplot can be constructed from a data matrix, where conventionally each column represent a variable, and each row includes the variables value for a given case.
The general layout of the computations is:
According to the previous scheme of the computations, there are several possibilities for the construccion of a Biplot. Some of them are more usual, and we include four of them as "Canned analyisis". They are accessible via the Define data processing... in the Biplot... menu button.
There are three types of coordinates (Standard, Principal, and Canonical), and four standard Biplot/map options that are accessible through the Biplot type item in the Biplot... menu button.
Asymmetric map (form Biplot) of the rows.
Asymmetric map (covariance Biplot) of the columns.
Symmetric map (not a Biplot).
Symmetric (canonical?) Biplot.