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我有很多时间序列，时间段：天、周或月。通过stl()功能，我可以看到特定趋势的timeserie样子。我需要检测趋势timeserie是增加还是减少。我该如何管理？
stl()
timeserie
或者也许有人可以建议另一种趋势检测算法？
谢谢！