The relationship of bristlecone/foxtails to gridcell temperature is something that I’ve discussed at length, but, surprisingly, I’ve never illustrated it at the blog. This is a type of relationship that, in some ways, is well suited to blogs. It’s simple to discuss; it’s important. It would be amply illustrated and discussed in business feasibility studies […]
There’s an interesting knock-on effect from the collapse of MBH98 Figure 7 (see here and here). See update from UC in May 2011 below in which he did a “bit-true” replication. We’ve spent a lot of time arguing about RE statistics versus r2 statistics. Now think about this dispute in the context of Figure 7. […]
Sometimes we hear that science is "self-correcting". To be "self-correcting", however, individual people have to step up to the plate now and then and actual do the work. To the extent that the term "science" includes the work of Mann et al., then analysis of MBH98 Figure 7 , which was actually the culmination of […]
Since Chefen has brought this figure into play, there’s much to consider about it. [Also see followup here.] For interested parties, the data is at WDCP here . I haven’t got to checking Chefen’s results yet, but wanted to table interesting results in passing. As Jean S noticed, the Corrigendum stated that an “old” version […]
In my previous comment on Ritson’s AR1 calculation, I think that I correctly diagnosed that the calculation was goofy, but I didn’t diagnose what was going on correctly (thanks to Demetris Kousoyannis who emailed me). I’ve re-visited it and I’m pretty sure that I’ve now diagnosed the problem with what Ritson was doing. My starting […]
Just when you think that the MBH98 Little Shop of Horrors has been fully explored, something new turns up. I’ve never spent any time on the last part of MBH98, where he does a "detection and attribution" study linking his temperature reconstruction to solar, volcanic and CO2. All these detection and attribution studies (e.g. Hegerl) […]
This is the eyewitness account by Justin Rietz of the talk given by Michael Mann at University of California at Santa Cruz on Wednesday 10th May 2006. I made it down to Santa Cruz for the Mann presentation Wednesday night. I missed the first 10 to 15 minutes (those of you who live or have […]
Wahl et al [2006 ] fulminated as follows : The VS04 results have been interpreted to cast serious doubt on the MBH reconstruction. … However, these results are in large part dependent on a detrending step not used by MBH, which is physically inappropriate and statistically not required. The take-away message for the climate community […]
Eduardo Zorita and I are in the process of reconciling some results. We have taken one issue off the table – VZ implemented Mannian PCs accurately enough that this does not account for any differences between our results and theirs. So I take back some observations and I’ll place updates in appropriate places. In fairness […]
Eduardo Zorita sent the following in as a comment on earlier postings. As I did on a similar occasion with Rob Wilson, I’m re-posting this as a separate post on its own to ensure that it’s properly noted.
Climate Audit 
Michael Mann at UC Santa Cruz
This is the eyewitness account by Justin Rietz of the talk given by Michael Mann at University of California at Santa Cruz on Wednesday 10th May 2006. I made it down to Santa Cruz for the Mann presentation Wednesday night. I missed the first 10 to 15 minutes (those of you who live or have […]