It's important to realise that there is nothing magic about processes with long term persistence. (realclimate.org)
Self - similar processes exhibit Hurst - Kolmogorov (HK) pragmaticity (aka long term persistence (LTP)-RRB- and thus have varying means. (wattsupwiththat.com)
We have computed the Durbin Watson statistics for all series and none suggest that residual long term persistence is present. (blogs.nature.com)