Designed to be compatible with the R package 'DBI' (Database Interface)
    when connecting to Amazon Web Service ('AWS') Athena <https://aws.amazon.com/athena/>.
    To do this 'Python' 'Boto3' Software Development Kit ('SDK')
    <https://boto3.amazonaws.com/v1/documentation/api/latest/index.html> is used as a driver.

Describes a new procedure of reducing items in a rating scale called Rating Scale Reduction (RSR). The new stop criterion in RSR procedure is added (stop global max). The function order is replaced by sort.list.

We implement a test of the rational expectations hypothesis based on the marginal distributions of realizations and subjective beliefs from D'Haultfoeuille, Gaillac, and Maurel (2018) <doi:10.3386/w25274>. This test can be used in cases where realizations and subjective beliefs are observed in two different datasets that cannot be matched, or when they are observed in the same dataset. The package also computes the estimator of the minimal deviations from rational expectations than can be rationalized by the data.

Functions to manipulate rational functions, including basic
    arithmetic operators, derivatives, and integrals with EXPLICIT forms.

Provides functions to deal with matrix algebra for matrices
    with rational entries: determinant, rank, image and kernel, inverse,
    Cholesky decomposition. All computations are exact.

Based on the 'qspray' package, this package introduces the new 
    type 'ratioOfQsprays'. An object of type 'qspray' represents a multivariate 
    polynomial with rational coefficients while an object of type 
    'ratioOfQsprays', defined by two 'qspray' objects, represents a fraction of 
    two multivariate polynomials with rational coefficients. Arithmetic 
    operations for these objects are available, and they always return 
    irreducible fractions. Other features include: differentiation, 
    evaluation, conversion to a function, and fine control of the way to print 
    a 'ratioOfQsprays' object. The 'C++' library 'CGAL' is used to make the 
    fractions irreducible.