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(hi, i cant comment so 1. arima (1,0,0) = ar (1) need 1 previous observation ar (2) need 2 previous observations 2. arima do calculate with training data value of coeficients (for ar (1) its like: intercept and ar1 you can calculate coeficients arima(data[1:400] or you can also arima(data[1:472] (1) so you always need previous (current data) to make 1 step ...

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