roots.allocation(x, width = c(0.035, 0.035), min.modulus = 0.4)
"plot"(x, xlim, ylim, ...)
"print"(x, units = c("radians", "degrees", "pi"), digits = 4, ...)roots.allocation, an object of class Arima (see arima);
for print.tsdecARroots and plot.tsdecARroots, an object of class tsdecARroots
returned by type="roots.allocation".units="pi" prints the
argument in radians as multiples of $pi$.print.roots.allocation returns a list of class tsdecARroots.
plot.tsdecARroots displays the roots in the complex plane and
print.tsdecARroots shows a summary.
width[1]]
are allocated to the trend or transitory component. In particular,if the modulus
is below min.modulus, then they are are allocated to the transitory component,
otherwise to the trend.The seasonal frequencies are defined as $\omega[j]=2\pi j/S$,
for $j=1,...,S-1$,
where $S$ is the periodicity of the data (e.g., $S=4$ in quarterly data
and $S=12$ in monthly data).
Roots related to cycles of frequency within the range
[$\omega[j] - $seasonal.width,
$\omega[j] + $seasonal.width] are
assigned to the seasonal component.