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Contrasts function for factors in the earth response. For internal use by earth.
earth
contr.earth.response(x, base, contrasts)
Returns a diagonal matrix. An example for a 3 level factor with levels A, B, and C:
A
B
C
A B C A 1 0 0 B 0 1 0 C 0 0 1
a factor
unused
contrasts