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...hange. My questions are, 1) How can I compare the difference among the indices, and how can I say there is significant differnce between two time series. They don't have the same values in the same date, but they may have the similar tendency and change curves? 2) I also want to compare the interannual variation of the vegetation index in the same station. Of course, the index can be separated into several sub-series, i.e., one year one sub-series. Now I have the same question as 1), how can I compare the significant differnce between different year? If there are mature theoretical framewo...