QSpecQuantity-class: Class for a Quantile Spectral Estimator.
Description
QSpecQuantity is an S4 class that provides a common
interface to objects that are of the functional form
$f(\omega; x_1, x_2)$, where
$\omega$ is a frequency parameter and $x_1,
x_2$ are level parameters. For each combination of
parameters a complex number can be stored. Examples for
objects of this kind currently include the quantile (i. e.,
Laplace or copula) spectral density kernel [cf.
QuantileSD for an implementation], an
integrated version of the quantile spectral density kernels
[cf. IntegrQuantileSD for an implementation],
and estimators of it [cf. QuantilePG and
SmoothedPG for implementations].