Dell-EMC
E20-007 · Question #116
Before you build an ARMA model, how can you tell if your time series is weakly stationary?
The correct answer is C. There appears to be a constant variance around a constant mean. See the full explanation below for the reasoning.
Question
Before you build an ARMA model, how can you tell if your time series is weakly stationary?
Options
- AThe series is normally distributed.
- BThe mean of the series is close to 0.
- CThere appears to be a constant variance around a constant mean.
- DThere appears to be no apparent trend component.
How the community answered
(23 responses)- A4% (1)
- B4% (1)
- C78% (18)
- D13% (3)
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