"spec"
. For multivariate
time series it plots the marginal spectra of the series or pairs plots
of the coherency and phase of the cross-spectra.# S3 method for spec
plot(x, add = FALSE, ci = 0.95, log = c("yes", "dB", "no"),
xlab = "frequency", ylab = NULL, type = "l",
ci.col = "blue", ci.lty = 3,
main = NULL, sub = NULL,
plot.type = c("marginal", "coherency", "phase"),
…)plot.spec.phase(x, ci = 0.95,
xlab = "frequency", ylab = "phase",
ylim = c(-pi, pi), type = "l",
main = NULL, ci.col = "blue", ci.lty = 3, …)
plot.spec.coherency(x, ci = 0.95,
xlab = "frequency",
ylab = "squared coherency",
ylim = c(0, 1), type = "l",
main = NULL, ci.col = "blue", ci.lty = 3, …)
"spec"
.TRUE
, add to already existing plot.
Only valid for plot.type = "marginal"
.
ci
is strictly
positive."dB"
, plot on log10 (decibel) scale (as S-PLUS),
otherwise use conventional log scale or linear scale. Logical
values are also accepted. The default is "yes"
unless
options(ts.S.compat = TRUE)
has been set, when it is
"dB"
. Only valid for plot.type = "marginal"
.
plot.type =
"marginal"
. If missing, a description of the smoothing is used.spectrum