Tag Archives: Esper

Is Yamal Homogeneous? An Esper-Style Answer.

Starting with the first of my recent posts on Yamal, I raised the issue of whether the CRU 12 actually came from a homogeneous population to the subfossil population. Although Briffa’s online response to my Yamal posts stated that CRU has “stressed” potential problems arising from “inhomogeneous” sources” in their “published work”, I have been […]

RCS Homogeneity- Esper in Jaemtland

Starting with the first of my recent posts on Yamal, I raised the issue of whether the CRU 12 actually came from a homogeneous population to the subfossil population. This issue was related to the surprisingly small sample size of the supposedly “highly replicated” Yamal chronology, but is distinct. In his online response to Yamal […]

Esper et al 2009 on West Siberia

Esper et al (Global Change Biology, in press) “Trends and uncertainties in Siberian indicators of 20th century warming” is relevant to our present consideration of Briffa’s Yamal, which I will get to shortly. The cutline in their abstract declares in effect that the divergence problem is not as “bad as we thought”: Despite these large […]

Trouet et al 2009 – More Info

On April 10, I was notified by NOAA that a little bit of data from Trouet was now online at NOAA WDCP. The archive is the absolute minimum; even Science would require them to archive this data if asked. However, it is totally inadequate for replication. However, every little bit of data helps and here’s […]

Esper in Morocco

The other series in Trouet that contributes to their NAO reconstruction is the Morocco chronology from Esper the non-Archiver. In the Scotland speleo series, we observed an awkward detrending step prior to the NAO reconstruction. In the Morocco series, there proves to be some awkward splices: a splice of two different series versions at a […]

Data Archiving for Trouet-Esper

Trouet et al was released on April 2, 2009 with an SI that did not include any data. Discussion began here on April 3 in the comments here and later that day I posted on it here observing: Unfortunately, the authors failed to provide any digital data citations (see for example AGU policies on this, […]

Mann's PC1 in Esper and Frank 2008

On previous occasions, we’ve noticed some strange appearances of the Mann hockey stick under different disguises. In Inconvenient Truth, a splice of Mann’s hockey stick and CRU instrumental data is described as “Dr Thompson’s thermometer”. Today, I noticed another peculiar incident, where Esper and Frank (Clim Chg 2008), who one would think would know better, […]

Juckes and the Esper and Jones CVMs

The Euro Hockey Team (EHT) present a variety of results using CVM methods on proxies from 5 canonical Team studies: Jones Briffa 1998; MBH99; Esper 2002; Moberg 2005 and Hegerl 2006. CVM (take the average of scaled proxies and re-scale the average to match the instrumental record) seems to me to be a less dangerous […]

Esper Methodology

Getting methodological information from Esper is a bit like dealing with Mann, a lot like dealing with Mann. It really makes me wonder whether there might be some clunker like Mann’s PC methodology lurking in Esper’s closet. Like Mann, instead of providing a comprehensive methodological desscription ideally with code as in econometrics journals, Esper would […]

Taimyr – Linear or Nonlinear?

While I’ve got Esper open, here’s some thoughts on the division of cores and sites between "linear" and "nonlinear" – where I’ve been seeking an operational definition for some time. Herr Esper told Science: The split into linear and non-linear ring width series is shown in a supplementary figure accompanying the Science paper. The methods […]

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