From	Michael E. Mann	Date	Wed, 05 Feb 2003 13:19:29 -0500
To	Irina Fast
CC	Scott Rutherford, Zhang, Michael E. Mann, Tim Osborn, Keith Briffa, Irina Fast, Malcolm K. Hughes, ray bradley
Subject	Re: program code
Dear Irina, The code we used in Mann/Bradley/Hughes 1998 was not changed or "improved", but there may be different versions of the code floating around, and in a previous email to Uli Cubasch, I indicated that I was not sure the version you have (from Tim Osborn), is identifical to the version we used in our original paper (it would require some work on my part to insure it gives precisely the same results, and I don't have the time to do that). I suspect, however, that the code is the same as the one we used in our paper and any differences, if they exist, should be minor (as long as the code compiles and runs correctly on the platform you have--the possible platform-dependence of fortran is a potential cause for concern here). Numerous people have coded up our method independently, including Ed Zorita, w/ whom I believe your group has a close collaboration, and my graduate student Zhang has successfully coded this up independently in Matlab (its a short script, which didn't take Zhang long to write anyway). I'm copying this message to Zhang, so that he can provide you with his matlab version of the code if you are interested. Because Zhang's version is in Matlab, it should run correctly, independently of the particular platform (an advantage over the fortran code) [As an aside, on a pedagogical note, I would still encourage you to code this up yourself]. As I indicated in a previous email to Uli, the selection of the optimal subset of EOFS to retain is not automated in the code, and you need to do that yourself...The methodology we used is described in detail in our publications. We have tested this method against the approach our group now uses for climate field reconstruction (Schneider RegEM approach), and find that the results are similar, but the cross-validation statistics improve slightly w/ the RegEM approach, which we now favor and use in place of the old, Mann et al approach. Details of this latter approach are described in these two manuscripts (as well as the original paper by Schneider referenced within): Mann, M.E., Rutherford, S., Climate Reconstruction Using 'Pseudoproxies', Geophysical Research Letters, 29 (10), 1501, doi: 10.1029/2001GL014554, 2002. available at: [1]ftp://holocene.evsc.virginia.edu/pub/mann/Pseudoproxy02.[2]pdf Rutherford, S., Mann, M.E., Delworth, T.L., Stouffer, R., Climate Field Reconstruction Under Stationary and Nonstationary Forcing, Journal of Climate, 16, 462-479, 2003. available at: [3]ftp://holocene.evsc.virginia.edu/pub/mann/Rutherfordetal-Jclim03.pdf The RegEM code is available over the web, and Scott Rutherford can provide you with the ftp side if you are interested. It, too, is available only in matlab. I hope you find this information of help. Best of luck w/ your research, mike mann At 06:10 PM 2/5/03 +0100, Irina Fast wrote: Dear Michael, I believe that you have not heard about me as yet. My name is Irina Fast. Since the January 2003 I am a PhD student at the Free University in Berlin in the framework of the EU-Project SOAP. My supervisor is Ulrich Cubasch. At the SOAP's start-up meeting it was proposed to use your multiproxy calibration method (published in 1998) for the joint analysis of model simulations and proxydata. Because your method was essential improved since 1998 I would like to know if you kann provide us with your program code. We could try to code your approach ourselves, but we do not know if this kind of analysis will success in our case. In the case of failure we will have to search for other analyses methodes. And the timespan for the data processing is rather short. Naturally you will not miss our gratitude and acknowledgement. I apologise for my mistakes in this letter. Best regards Irina Fast -- ************************************* Irina Fast Freie Universität Berlin Institut für Meteorologie Carl-Heinrich-Becker-Weg 6-10 D-12165 Berlin Germany e-mail: f14@zedat.fu-berlin.de phone: +49 (0)30 838 711 22 fax: +49 (0)30 838 711 60 ************************************* _______________________________________________________________________ Professor Michael E. Mann Department of Environmental Sciences, Clark Hall University of Virginia Charlottesville, VA 22903 _______________________________________________________________________ e-mail: mann@virginia.edu Phone: (434) 924-7770 FAX: (434) 982-2137 [4]http://www.evsc.virginia.edu/faculty/people/mann.[5]shtml References 1. ftp://holocene.evsc.virginia.edu/pub/mann/Pseudoproxy02.pdf 2. ftp://holocene.evsc.virginia.edu/pub/mann/Pseudoproxy02.pdf 3. ftp://holocene.evsc.virginia.edu/pub/mann/Rutherfordetal-Jclim03.pdf 4. http://www.evsc.virginia.edu/faculty/people/mann.shtml 5. http://www.evsc.virginia.edu/faculty/people/mann.shtml