| "As
to the Mann data, it has not "always been available".
Some information was available in 1998. Proxies and other info
for MBH99 were available in 1999. In April 2003,the proxy
data was not in the public section of Mann's FTP site (which
itself started only in July 2002). When I inquired in April
2003, Rutherford said that there was no public location
of the data and after a few weeks provided a URL in the /sdr/
directory, pointing to a file which had been archived in August
2002. There turned out to be problems with this dataset and
after publication of our first article in Oct 2003, Mann placed
the directory now labelled MBH98 in the public area of
his FTP site in Nov 2003 and deleted the dataset in the /sdr/
directory previously referenced. The data as used in this new
directory was inconsistent with the original SI in some respects
and Nature required a Corrigendum which was published in July
2004. Unusually, Nature also required a complete new SI.
One
of the reasons was that the number of PC series used could
not be decoded from the Nov 2003 directory and was provided
for the first time in the Corrigendum SI in July 2004 (which
also provided the underlying temperature dataset no longer
available from CRU). You remember the 159 series which Mann
said were used in Nov 2003 - this could not be deduced from
the Nov 2003 directories. Of course, this figure was also
incorrect. It looks like the July 2004 dataset relates to
the one originally used, although the source code posted up
in connection with the Barton inquiry calls for datafiles
that do not exist in any of the presently archived datafiles.
While it is possible to approximately replicate MBH98 results
(as both we and Wahl and Ammann have done - and our
current emulations are almost identical), neither of us has
been able to replicate MBH98 results exactly. This is aside
from the inaccurate description of methodology in MBH98 -
most notably the inaccurate description of principal components
methodology which we have discussed elsewhere. But there are
other oddities which one would never have guessed - such as
arbitrary extensions of some series and truncations ofother
series, and the use of obsolete and/or grey versions of other
series. Residual series used for calculation of verification
statistics remain unavailable to this day. So don't say that
this has "always" been available.
As
to other multiproxy studies: Crowley has "misplaced"
his original data and was only able to locate a smoothed and
transformed version of his data. He also could not recall
where he got the digital versions of certain series, so this
is problematic.
Briffa
has never identified even the sites used in Briffa et al
[2001]. Some of the data used in Esper et al [2002]
may be archived, but much isn't and it is impossible to verify
versions. Most of Moberg's data is located in public
archives, but some isn't and he has been unable or unwilling
to provide the missing data. Some of the data used in Mann
and Jones [2003] is not archived. Phil Jones says that
he doesn't know the weights used in this study.
Posted by Steve McIntyre at November 20,
2005 07:15 PM" in Comments: IPCC Hockey Stick Matters
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