If you go to the original Nature Supplementary Information for MBH98 here, and try to inspect the list of data and list of verification stats (such as they are), you will find that they are no longer there. Update: here
This is the first replication note that gets into the meat of our emulation. Previously we’ve noted the non-replicability of certain MBH98 steps, but, since relevant intermediate calculations were archived, we were able to proceed using the archived intermediate calculations. Here we show the key replication step calculating “reconstructed [temperature] principal component” series. Archiving is […]
One of the fun parts about finding the Hockey Stick is the many guises in which it appears. If you didn’t know what you were looking at, you could easily miss the significance of the information provided for you by people in authority. Today’s scientific authority is the government of New Zealand.
The calculation of temperature PC series needs to be distinguished from the calculation of tree ring PC series. Procedures for the handling of missing data in the temperature dataset were described in the MBH98 Corrigendum SI for the first time in July 2004, specifying that linear interpolation was done, but not specifying the handling of […]
Gridcell standard deviations for the MBH98 temperature dataset were archived for the first time (together with the temperature dataset) in the Corrigendum SI. Here the difference between detrended and undetrended standard deviations is examined, as well as the difference between using anomalies-new (MBH98) and HadCRU2. Link
The MBH98 Corrigendum purported to explain the discrepancy of 35 series between the series listed in the original SI and the series actually used as follows: These series, all of which come from the International Tree Ring Data Bank (ITRDB), met all the tests used for screening of the ITRDB data used in Mann et […]
Gavin Schmidt and Caspar Amman of realclimate have written a "Dummies’ Guide" giving their take on the dispute: Due to popular demand, we have put together a ‘dummies guide’ which tries to describe what the actual issues are in the latest controversy, in language even our parents might understand.Link I’ll comment more on this later, […]
Mann et al. [2000] listed 5 quality control criteria, which were said to have been applied in MBH98 for the inclusion of tree ring sites. These criteria were again referred to in the MBH Corrigendum in July 2004. In total, the information in the SI to MBH98 showed the use of 394 sites, either as […]
A lot of people who are interested in the issue of the effect of bristlecone pines on MBH98 do not have access to Graybill and Idso [1993], the underlying reference, which we referred to in both MM05 articles and which I mentioned in this post . Here’s a pdf version , courtesy of the U.S. […]
This is a short discussion of the issues arising when a calculation step in a multi-step study cannot be replicated.
Climate Audit 
More Commentary #5: realclimate
Gavin Schmidt and Caspar Amman of realclimate have written a "Dummies’ Guide" giving their take on the dispute: Due to popular demand, we have put together a ‘dummies guide’ which tries to describe what the actual issues are in the latest controversy, in language even our parents might understand.Link I’ll comment more on this later, […]