Let’s say that you were a partner of the firm North, Hegerl and Cicerone and charged with issuing an opinion on the financial statements of Team Capital Management Inc.(TCM) And let’s say that you were doing so in heady pre-crash days when markets were going up and mark-to-market accounting was something that the companies wanted […]
The SI for MBH98 listed 34 tree ring series that were not actually used. This was acknowledged in their 2004 Corrigendum which provided the following implausible excuse: 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 ref. […]
if Team methodological descriptions were correct? Mann says: All ITRDB tree-ring proxy series were required to pass a series of minimum standards to be included in the network: (i) series must cover at least the interval 1750 to 1970, (ii) correlation between individual cores for a given site must be 0.50 for this period, (iii) […]
Many of the good folks who write the papers and keep the databases seem not to use their naked eyeballs. By that I mean, they seriously think that you can invent some new procedure, and then apply it across the board to transform a group of a thousand datasets without looking at each and every […]
Both in climate blog world and the financial world, there has been much talk recently about the interaction of models and data distributions. Linear regression models assume normal distributions. What happens to models when the data distributions don’t meet the assumptions. Sometimes it doesn’t matter much, sometimes it does. But it seems like an important […]
In my last post, I observed an interesting bimodality which almost certainly appears to originate in Mann’s pick two procedure on low-correlation tree ring networks. Some readers may recall the interesting bimodal distribution that we reported in MM 2005 (GRL); the introduction of bimodality into a distribution seems like a sure sign of a picking […]
Do not post anything other than programming comments. Absolutely no piling on please.
I’ve adopted a graphic from the R-gallery to better illustrate the issues that we’re working on with the Mann proxy correlations. I think that this should help. Figure 1. Scatter plot of calculated gridcell correlations to Mann SI correlations, color coded by “proxy” class, together with marginal histograms. The dotted red lines show r=0.14, a […]
Update Sep 24 – I suggest that you start with a later post here. The purpose of working through frustrating details of Mannian lat-longs and so on was to start testing the assertion that the network contained 484 “significant” proxies and that this meant something. As so often, there’s more to this than meets the […]
Today’s Mannian mystery takes us to Kenya Tanzania, not to Kilimanjaro itself, but to the great plains, still home to prides of lions, herds of wildebeest and giraffes.
Climate Audit 