How to use ARIMA coefficients from BigQuery

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1

I am trying to use Auto ARIMA from BigQuery and I just want to understand the results. That’s what BigQuery is giving me:

Store A

  • Non Seasonal P = 0
  • Non Seasonal D = 1
  • Non Seasonal Q = 1
  • Has Drift = False
  • Log Likelihood = -7,073.79
  • AIC = 14,153.579
  • Variance = 4,954,056.028
  • Seasonal Period = Yearly

Coeficients from Store A

  • ar_coefficients = NULL
  • ma_coefficients = -0.80490889915091468
  • intercept_or_drift = 42.211438084963184

I trained the model using weekly income

How to fit this information in an equation?

2

All I could find is this documentation that explains how to properly use the arima coefficient function on BigQuery.