Question: Would I be able to generate an AR1: auto regressive model or moving average forecast model? I only have four years of data and it

Would I be able to generate an AR1: auto regressive model or moving average forecast model? I only have four years of data and it is not broken up into months, only years. I am trying to show the ultimate decline in movement of these parts. I have 5850 lines (parts) and four and annual sales like so:

Part Number Description AC Code 2019 2018 2017 2016 ONHAND

0030.2337. SET SCREWCUPM8 X25 AC5 0 0 0 32 221

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