This function is called from the functions
docabasic, socabasic, sonscabasic and
It allows the analyst to compute the orthogonal polynomials of the ordered categorical variable.
The number of the polynomials is equal to the variable category less one.
The function computes the polynomial transformation of the ordered categorical variable.
The ordered scores of an ordered variable. By default
The marginals, relative frequencies of the ordered variable.
Describe the value returned
the matrix of the orthogonal polynomials without the trivial polynomial.
Note that the sum of the marginals of the ordered variables should be one.
Rosaria Lombardo and Eric J Beh
Beh EJ and Lombardo R 2014 Correspondence Analysis: Theory, Practice and New Strategies. John Wiley & Sons.
Emerson PL 1968 Numerical construction of orthogonal polynomials from a general recurrence formula. Biometrics, 24 (3), 695-701.