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http://www.fromthebottomoftheheap.net/2011/06/12/additive-modelling-and-the-hadcrut3v-global-mean-temperature-series/
http://www.fromthebottomoftheheap.net/2011/07/21/smoothing-temporally-correlated-data/
2. Seasonal GAM:
http://www.r-bloggers.com/identifying-periods-of-change-in-time-series-with-gams/、
这两个看懂了,基本上就可以自己做了