Description Usage Arguments Details Value References Examples
The function to estimate the Lomb periodogram for a spectral analysis of unevenly sampled data.
1 |
y |
vector of length n representing the unevenly sampled time series. |
x |
the a vector (of length n) representing the times of observation. |
freq |
the frequencies at which the periodogram is to be calculated. If NULL the canonical frequencies (the Fourier frequencies) are used. |
This is the Lomb periodogram to test for periodicity in time series of unevenly sampled data.
Missing values should be deleted in both x and y before execution.
An object of class "lomb" is returned consisting of the following components:
freq |
the frequencies as supplied. |
spec |
the estimated amplitudes at the different frequencies. |
f.max |
the frequency of maximum amplitude. |
per.max |
the corresponding period of maximum amplitude. |
p |
the level of significance associated with the max period. |
Lomb, N.R. (1976) Least-squares frequency-analysis of unequally spaced data. Astrophysics and Space Science 39, 447-462.
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