Ahh, thanks, that helped! Is the standard error being calculated by 1/sqrt(N-3) though? I ask because visually inspecting the plots of the 6 CCFs I've done, only 4 have a C.I. line that look "about right" according to my own calculations using this formula. The other 2 are a little below my calculations (although probably close enough). However, maybe I caught these two only because in these cases, my calculation happened to be a value above a tick mark while the line shown was below that tick mark. Maybe I'm not using the exactly right formula? Is there a way of extracting the value used? Thanks again!
> Date: Thu, 8 May 2008 19:54:25 +0100 > From: [EMAIL PROTECTED] > To: [EMAIL PROTECTED] > Subject: RE: [R] significance threshold in CCF > CC: r-help@r-project.org > > On 08-May-08 18:23:27, E C wrote: > > Hi everyone, > > > > When the CCF between two series of observations is plotted in R, a line > > indicating (presumably) the significance threshold appears across the > > plot. Does anyone know how this threshold is determined (it is > > different for each set of series) and how its value can be extracted > > from R? I've tried saving the CCF into an object and unclassing the > > object, but there's nothing there to indicate this. > > Some sample code to show what I mean: > > x <- c(1,2,3,4,5,6,7,8,9) > > y <- c(3,4,5,6,7,8,9,10,11) > > ccf(x, y, plot=T) > > Thanks in advance! > > Have a look at ?plot.acf (also used for plotting ccf objects) > Ted. > > -------------------------------------------------------------------- > E-Mail: (Ted Harding) <[EMAIL PROTECTED]> > Fax-to-email: +44 (0)870 094 0861 > Date: 08-May-08 Time: 19:54:20 > ------------------------------ XFMail ------------------------------ _________________________________________________________________ If you like crossword puzzles, then you'll love Flexicon, a game which comb[[elided Hotmail spam]] [[alternative HTML version deleted]] ______________________________________________ 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.