cc: Keith Briffa date: Sat, 13 Jul 2002 14:14:55 -0400 from: Ed Cook subject: Evolutive spectral analysis. to: "Ian Harris (Harry)" Hi Harry (and Keith), Keith has asked me to send you some stuff on programs to do evolutive spectral analysis. First, here is the web site for doing it the wavelet way. http://paos.colorado.edu/research/wavelets/ If your data are less then 2000 years long, you can paste your series columnwise into a window and the evolutive spectral analysis is done for you. If you have more then that number of years, you can download Fortran, IDL, or MATLAB versions of the program. Presumably, you can expand the dimensions to handle whatever length time series you want to run. Using this program is probably the easiest way to go. It is also widely accepted, although I think that there is an argument for do it in the more classical sliding window way using MTM. If you do want to go the MTM way, I am sending you the Fortran source code, originally from Mike Mann and slightly modified by me, along with four small data files that contains stats for computing confidence levels. Those four files could easily be incorporated into data statements in the program, but neither Mike nor I have done that. I must say that Mike's program is not that easy to figure out how to use. It does work okay, but the learning curve may be a bit steep and frustrating. I am off to China on Monday, July 15 at 9:30am and do not return until July 31. So, if you have any problems or questions, you must either contact me before 9:30am (possible due to the time difference) or wait until after my return. Cheers, Ed Attachment Converted: "c:\eudora\attach\mtmcohere1.f" Attachment Converted: "c:\eudora\attach\fcoher.dat" Attachment Converted: "c:\eudora\attach\fcoher-sec.dat" Attachment Converted: "c:\eudora\attach\chisquare.dat" Attachment Converted: "c:\eudora\attach\ftest.dat"