Computing the periodogram
This is a wrapper that computes the periodogram
periodogram(y,log='no',plot=TRUE,ylab="Periodogram", xlab="Frequency",lwd=2,...)
y |
A univariate time series |
log |
if set to "yes", the periodogram is plotted on the log-scale; default="no" |
plot |
The periodogram is plotted if it is set to be TRUE which is the default |
ylab |
label on the y-axis |
xlab |
label on the x-axis |
lwd |
thickness of the periodogram lines |
... |
other arguments to be passed to the plot function |
A list that contains the following elements:
freq |
Vector of frequencies at which the spectral density is estimated. (Possibly approximate Fourier frequencies. |
spec |
Vector of estimates of the periodogram at frequencies corresponding to freq. |
Bloomfield, P. (1976) Fourier Analysis of Time Series: An Introduction. Wiley.
Brockwell, P. J. and Davis, R. A. (1991) Time Series: Theory and Methods. Second edition. Springer.
data(star) plot(star,xlab='Day',ylab='Brightness') periodogram(star,ylab='Variable Star Periodogram'); abline(h=0)
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