For quite a while, I’ve urged people interested in gridded temperatures to really look at the SST data – realdata not adjusted data. SST makes up 2/3 of the record, but temperature critics spend 99.99% of their time on land data. In part, it’s because the data sets are much larger, but increased power of […]
Over the weekend (before I picked up my “regular” files), I started looking at Steve Mosher’s use of raster and zoo – both of which intrigue me a great deal, but got intrigued by something else and ended up finally figuring out how to extract .Z files within an R script without having to handle […]
Got back from the annual WFS conference at Erice, Sicily a couple of days ago. It is an interdisciplinary conference on world issues, in which climate is only a part, but an important part. As in previous visits, it was a very enjoyable visit – the conference attracts a lot of spouses, resulting in more […]
Geoff Sherrington and others on the First Difference Method post have requested a post for discussing Kriging. I am new to Kriging myself, so please correct me if I make any errors here. Steve McIntyre (who may be on the beach at the moment!) is far more knowledgeable, and has posted about the topic frequently […]
R coder mind of a Markov chain has replicated portions of the M&W work. They write: There are a bunch of “hockey sticks” that calculate past global temps. through the use of proxies when instrumental data is absent. There is a new one out there by McShane and Wyner (2010) that’s creating quite a stir […]
Over on WUWT (http://wattsupwiththat.com/2010/07/13/calculating-global-temperature/), Zeke Hausfarther and Steven Mosher have been discussing the calculation of global temperature from station data. They list several methods of combining records, noting that most of the major indices use the Common Anomalies Method (CAM). They mention, but do not discuss, the First Differences Method (FDM). In fact, FDM is […]
Guest post by Jeff Id from The Air Vent (used by invitation) Occasionally when working on one thing long enough, you discover something unexpected that allows you to take a step forward in understanding. At the ICCC conference, I met Steve McIntyre and took time to ask him how come Mann07 “Robustness of proxy-based climate […]
I’m off to Sicily tonight for the 2010 conference of the World Federation of Scientists, hosted by the redoubtable Antonio Zichichi. I’ll be a bit spotty checking in. I never did finish reporting on the 2009 conference as we got overtaken by Yamal and then by Climategate and the inquiries. I’ve got a better computer […]
As usual, a good analysis from Matt Briggs here
A reader (h/t ACT) draws attention to an important study on proxy reconstructions (McShane and Wyner 2010) in the Annals of Applied Statistics (one of the top statistical journals) A Statistical Analysis of Multiple Temperature Proxies: Are Reconstructions of Surface Temperatures Over the Last 1000 Years Reliable? It states in its abstract: We find that […]
Climate Audit 