1.2.1. patsy.ContrastMatrix¶

class patsy.ContrastMatrix(matrix, column_suffixes)[source]¶

A simple container for a matrix used for coding categorical factors.

Attributes:

matrix¶

A 2d ndarray, where each column corresponds to one column of the resulting design matrix, and each row contains the entries for a single categorical variable level. Usually n-by-n for a full rank coding or n-by-(n-1) for a reduced rank coding, though other options are possible.

column_suffixes¶

A list of strings to be appended to the factor name, to produce the final column names. E.g. for treatment coding the entries will look like "[T.level1]".

__init__(matrix, column_suffixes)[source]¶