nonstationarity

• “The debate over whether hurricane statistics show signs of nonstationarity is to me far more interesting and relevant than the absence or presence of a trend.”

  Pielke Jr on Spinning Science « Climate Audit

• “The word “trend” often is used to imply a nonstationarity in the stochastic process from which observed number of hurricane arrivals are a realization.”

  Pielke Jr on Spinning Science « Climate Audit

• “The first reason consists of the general nonstationarity climate, in particular during the period used for a calibration.”

  An Excellent Sonechkin Comment « Climate Audit

• “However, our method cannot deal with nonstationarity even though the normalization of the weights in the OA procedure minimizes the distortion of the trends in the data.”

  Statistics of Record-Breaking Temperatures « Climate Audit

• “Of course, any nonstationarity is likely to be a response to some kind of recent anthropogenic forcing”

  Mann at the NAS Panel « Climate Audit

• “In this respect it is not possible to infer nonstationarity or stationarity merely from data.”

  Juckes cites Wahl and Ammann « Climate Audit

• “I just thought I would supply a concrete and relevant example of how such a quadratic response to temperature is not only real, but could lead to time-series nonstationarity that violates assumptions made in the inferential leap one takes in going from calibration to reconstruction.”

  WSJ: House Energy report on the "mutual admiration society" « Climate Audit

• “Apparent temporal nonstationarity in the biological response of trees to climate might be a function of changes in climate itself [Vaganov et al., 1999; Aykroyd et al., 2001], although caution is necessary since this could also arise stochastically [Gershunov et al., 2001].”

  NAS News and Schedule « Climate Audit

• “That is how stationary long-memory processes behave; it is not evidence of nonstationarity.”

  Juckes – Meet the Durbin-Watson Statistic « Climate Audit

• “It seems to me a more precise test is decreased speed of mean-reversion, which is to say that, given a + greenhouse shock there is a slow, and possibly zero-speed reversion to the previous mean ie nonstationarity.”

  ARMA (1,1) Coefficients for CRU Gridcells « Climate Audit

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