Why, when random data is used as input, does their model still produce a hockey stick? How on earth do you rebut that?.
If you actually want to know the answers to these questions they are easy enough to find. Why don't you start with the stuff I've pointed you at?
http://www.realclimate.org/index.ph...-regarding-the-mann-et-al-1998reconstruction/
etcFalse Claims by McIntyre and McKitrick regarding the Mann et al. (1998) reconstruction
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mike @ 4 December 2004
A number of spurious criticisms regarding the Mann et al (1998) proxy-based temperature reconstruction have been made by two individuals McIntyre and McKitrick ( McIntyre works in the mining industry, while McKitrick is an economist). These criticisms are contained in two manuscripts (McIntyre and McKitrick 2003 and 2004the latter manuscript was rejected by Nature; both are collectively henceforth referred to as MM). MM claim that the main features of the Mann et al (1998henceforth MBH98) reconstruction, including the hockey stick shape of the reconstruction, are artifacts of a) the centering convention used by MBH98 in their Principal Components Analysis (PCA) of the North American International Tree Ring Data Bank (ITRDB) data, b) the use of 4 infilled missing annual values (AD 1400-1403) in one tree-ring series (the St. Anne Northern Treeline series), and c) the infilling of missing values in some proxy data between 1972 and 1980. Each of these claims are demonstrated to be false below.
[McIntyre and McKitrick have additionally been discredited in a recent peer-reviewed article by Rutherford et al (2004)].
[Added 1/6/05: See also "On Yet Another False Claim by McIntyre and McKitrick" which discredits the claimed "Monte Carlo" Experiment Results from the Rejected McIntyre and McKitrick comment to Nature]
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