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| acf | Autocovariance function Estimation |
| ar | Fit autoregressive models to time series |
| ar.yw | Fit autoregressive model by solving Yule-Walker equations |
| plot.acf | Autocovariance function Estimation |
| plot.spec | Spectral Density Estimation |
| spec | Spectral Density Estimation |
| spec.pgram | Estimate spectral density of a time series from smoothed periodogram |
| spectrum | Spectral Density Estimation |