The 5 Censored PCs

When one contrasts the extraordinary MBH claims of robustness of their reconstruction with the admitted non-robustness of this reconstruction to the PC4 of the North American tree ring network, it is interesting to examine the first 5 PC series in the CENSORED file at Mann’s FTP site. These are plotted in the following figure.
First 5 PCs from Mann's CENSORED Directory

These PC series have been calculated from the 50 non-bristlecone pine series and obviously there is no 20th century hockey stick shaped series among them. These PC series have presumably been calculated with Mann’s flawed PC method, but even this method could not mine a hockey stick shape without the bristlecones. This shows about as vividly as one could imagine that the hockey stick is made out of bristlecone pine.


  1. TCO
    Posted Sep 11, 2005 at 2:21 PM | Permalink

    The CENSORED directory is scandalous.

  2. Peter Wilson
    Posted May 20, 2013 at 4:05 AM | Permalink

    “The hockey stick is made out of bristlecone pine”

    A phrase of extreme eloquence, which deserves to be widely disseminated. So much information in so few words.

    I plan to plagiarize it often

2 Trackbacks

  1. […] calculated principal components on a network that excluded bristlecone pines (which needless to say didn’t have a HS shape. Now Juckes et al introduces us to a new type of climate data: “restricted” data. The Team has […]

  2. […] proved to contain five calculations of what the graph would have looked like without any tree-ring samples from bristlecone pine […]

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