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Exam DY0-001 topic 1 question 42 discussion

Actual exam question from CompTIA's DY0-001
Question #: 42
Topic #: 1
[All DY0-001 Questions]

Given the following:

Which of the following time series models best represents this process?

  • A. ARIMA(1,1,1)
  • B. ARMA(1,1)
  • C. SARIMA(1, 1, 1) x (1, 1, 1)1
  • D. AR(1)
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Suggested Answer: D 🗳️
by SuntzuLegacy at May 19, 2025, 9:31 a.m.

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SuntzuLegacy
1 month, 1 week ago
Selected Answer: D
From the equation X t=δ+ϕ 1X t−1 +ω t, ω t∼N(0,σ ω2 ) ​we see that the current value X t depends only on its immediately preceding value X t−1plus a white-noise term 𝜔𝑡. This is precisely the definition of an AR(1) (autoregressive of order 1) process—there is one autoregressive term, no moving-average terms, and no differencing. Thus, the best match is: D. AR(1) ​
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