STL issue
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STL issue
Hi, I have an issue with the STL method to deseasonalize weekly data: I want to check whether the trend is accelerating or decelerating, so I look at the first difference, but it has strange spikes like those in the picture attached. Why does it happen? I checked with other series and it keep happening.
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- Fe ddaethom, fe welon, fe amcangyfrifon
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