Description Usage Arguments Details Value References Examples

The function to estimate the Lomb periodogram for a spectral analysis of unevenly sampled data.

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`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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