pergram: Calculate and Plot a Periodogram

In growth: Multivariate Normal and Elliptically-Contoured Repeated Measurements Models

Calculate and Plot a Periodogram

Description

pergram calculates the values of a periodogram, plot.pergram plots it, and plot.cum.pergram plots the corresponding cumulative periodogram.

Usage

pergram(y)

## S3 method for class 'pergram'
plot(
  x,
  add = FALSE,
  lty = 1,
  xlab = "Frequency",
  ylab = "Periodogram",
  main = "Periodogram",
  ylim = c(0, max(po[, 2])),
  ...
)

## S3 method for class 'pergram'
plot_cum(
  x,
  xlab = "Frequency",
  ylab = "Periodogram",
  main = "Cumulative periodogram",
  ylim = c(0, max(cpo + 1.358/(a + 0.12 + 0.11/a))),
  ...
)

Arguments

y	A time series vector.
x	Plotting parameters
add	If TRUE, adds a new periodogram to an existing plot.
lty	Plotting parameters
xlab	Plotting parameters
ylab	Plotting parameters
main	Plotting parameters
ylim	Plotting parameters
...	Plotting parameters

Value

pergram prints and returns a two-column matrix of class, pergram, containing the periodogram.

Methods (by generic)

• plot(pergram): Plot method

• plot_cum(pergram): Plot_cum method

Author(s)

J.K. Lindsey

Examples

y <- rnorm(100)
print(z <- pergram(y))
plot(z)
plot_cum(z)

growth documentation built on Feb. 15, 2026, 1:07 a.m.