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hi @kjetilbhalvorsen, thanks, but I don't think my problem is clustering per se since clustering would find distinct groups... I'm after allocating many time series to two groups such that these two groups are similar.
Thanks Tylerr, helpful to know about pmdarima (I almost recoded everything in R to take advantage of forecast::auto.arima), great this is also available in Python in the pmdarima package.
Thanks Stephan, but I have not back-transformed the data. All the residual analysis (training and validation sets) are on the transformed data. Thank you for the link, this will help with back-transforming.