duo() and duo_exceed() create paired mapping objects that combine two
variables, record their names, and assign the bivariate/exceed class as
an attribute for use in aesthetic mappings.
Usage
duo(v1, v2)
duo_exceed(estimate, error)
Value
A list-like object containing pairs of values from the two variables,
with attributes storing the variable names and the class.
Arguments
v1, v2
Input variables for duo().
estimate, error
Input variables for duo_exceed() representing the
point estimate and its uncertainty.