TCO asked about physical processes that can generate time series with autocorrelation properties. This is a harder question than it seems and leads into the giant topic of stochastic processes, which rapidly gets very complicated. I’m not in a position to give a thorough answer, although it’s a topic that interests me a lot. I’ve […]
1. What recent movie features the House Energy and Commerce Commitee? It even shows a hearing. Who befriends the star? What state is the Committee chairman (in the movie) from? 2. In what movie does Steven Spielberg play a county clerk? What does he do in the movie? 3. After Steffi Graf, what German-born tennis […]
One of the papers that has most informed my views on multiproxy studies (and I’ve mentioned it from time to time) is Ferson et al. [2003], Understanding Spurious Regressions in Financial Economics which I read a couple of years ago. "Spurious regression" here is a false relationship between series, frequently observed with highly autocorrelated series […]
I’m inching along with Esper. Here I plot up 10 of 14 sites – I’m pretty sure that most will correspond fairly closely to Esper versions (up to the undefined distinction between “linear” and “nonlinear” cores). For 20th century levels to exceed 11th century levels, the “active ingredients” in Esper seem to be the 2 […]
Here is Lamarche’s diagram of altitudes at the key bristlecone sites of Sheep Mountain and Campito Mountain (as noted below, when wood erosion is allosed for, the post-MWP decline is placed after 1500.)
Valmore Lamarche was perhaps the first person to suggest that temperature information could be extracted from bristlecone pine information and his early publications are often referenced. Lamarche et al. [1984] (with Fritts, Graybill and Rose) first postulated CO2 fertilization. As you know, I’m increasingly interested in changes in treeline elevation as a "low-frequency proxy". It […]
An Op Ed by David Legates of the University of Delaware in today’s National Post, entitled Where’s the data?: Holding science to prospectus standards would stop climate researchers from launching misrepresentations like the ‘Hockey Stick’ By: David Legates
Since I showed the effect of smoothing on the relationship of Dunde to temperature, I thought that it would be useful to post up a table showing the Jones et al [1998] proxy correlations to temperature versus my calculations using HadCRU2.
Thompson’s Dunde ice core is an extremely important proxy in multiproxy studies. There has been an increase in dO18 levels in the 20th century. Whether this is a proxy for temperature is not at all obvious on physical grounds. The relationship between dO18 and temperature in monsoon ice caps is opposite to that of polar […]
I’m asked from time to time for references on statistics. I’m going to start posting up some links and references in a Page (see right frame). Here’s one that I noticed which is both an excellent introduction to R and to statistics. John Verzani, Using R for Introductory Statistics The nice thing about R packages […]
Climate Audit 
Legates Op Ed
An Op Ed by David Legates of the University of Delaware in today’s National Post, entitled Where’s the data?: Holding science to prospectus standards would stop climate researchers from launching misrepresentations like the ‘Hockey Stick’ By: David Legates