I am having a hard time interpreting the phase and coherency plots. x is two timeseries that occur at the same time i.e.
a b 1 11.2 12.3 16 11.3 12.4 31 11.4 12.5 46 11.5 12.6 ...etc even though my example is does not show this they are oscillating at more or less the same frequency just shifted by t=x (imagine two sine waves offset with the 2nd sine wave starting at the peak of the first). I would like to know what x is. I think I am looking for the phase shift? The coherency? Cross-spectrum? And I have read the help files, Shumway and Stoffer has a small section on this, I don't have journal access, and I am having trouble finding anything on the internet. s = spec.pgram(x) par(mfrow = c(2,1)) plot(s, plot.type = "coh") plot(s, plot.type = "pha") Can R do the cross-spectrum of two timeseries? How? -- Let's not spend our time and resources thinking about things that are so little or so large that all they really do for us is puff us up and make us feel like gods. We are mammals, and have not exhausted the annoying little problems of being mammals. -K. Mullis ______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.