cross-validation

Careful calibration and cross-validation procedures are necessary to establish a reliable relationship between a proxy indicator and the climatic variable or variables of interest, providing a “transfer” function that allows past climatic conditions to be estimated.

Arctic climate variability prior to 100 years BP 2009

I've only skimmed the paper, but it looks like their model contains some adjustable parameters, and the phrase "cross-validation" doesn't appear anywhere in the text.

Open Source Forecasting, Arnold Kling | EconLog | Library of Economics and Liberty 2009

Their reconstruction failed critical cross-validation tests (we have publicized the R2 failure, but it fails others as well); it is not robust the presence/absence of bristlecone pines; the supposedly carefully proxies included bristlecone growth, which specialists say is contaminated by 20th century fertilization; their methodology includes a wildly biased “principal components” methodology (which is not actually a principal components method).

Road Map and Site Rules « Climate Audit 2007

A combination of cross-validation and bootstrap technique is useful for a robust validation.

Unthreaded #17 « Climate Audit 2007

It seems that there were not independent test sets used, but cross-validation indicates that there approach is possible.

Archive 2007-01-01 Egon Willighagen 2007

It seems that there were not independent test sets used, but cross-validation indicates that there approach is possible.

CDK Literature #1 Egon Willighagen 2007

This is especially critical if the above cross-validation is sensitive to the parameter in question, and is of course dramatically aggravated with the number of such choices.

Jean S on Rutherford et al 2005 « Climate Audit 2006

In IPCC TAR, he said that their reconstruction had significant skill in cross-validation tests.

Earth's climate crashes in 2013 « Climate Audit 2006

Mann said in MBH98 that verification r and r2 tests were used as well as RE and in IPCC TAR claimed significance in cross-validation tests.

Earth's climate crashes in 2013 « Climate Audit 2006

He said that he was not involved in writing the SPM, but was lead author of a chapter in which he was again victimized by the IPCC claim that the MBH model had statistical skill in cross-validation statistics.

It's Hard to Imagine… « Climate Audit 2006