Estimation of causal continuous‐time autoregressive moving average random fields
Estimation of causal continuous‐time autoregressive moving average random fields
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DOI:
10.1111/sjos.12444
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发表时间:
2020-01
影响因子:
1
通讯作者:
C. Klüppelberg;V. Pham
中科院分区:
文献类型:
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作者:
C. Klüppelberg;V. Pham
We estimate model parameters of Lévy‐driven causal continuous‐time autoregressive moving average random fields by fitting the empirical variogram to the theoretical counterpart using a weighted least squares (WLS) approach. Subsequent to deriving asymptotic results for the variogram estimator, we show strong consistency and asymptotic normality of the parameter estimator. Furthermore, we conduct a simulation study to assess the quality of the WLS estimator for finite samples. For the simulation, we utilize numerical approximation schemes based on truncation and discretization of stochastic integrals and we analyze the associated simulation errors in detail. Finally, we apply our results to real data of the cosmic microwave background.