Estimation of Long-Range Dependent Models with Missing Data: to Impute or not to Impute?
缺失数据下的长记忆模型估计:插补还是直接估计?AI 解读 ↓
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AI 根据所提供的论文材料归类:摘要明确研究 ARFIMA 长记忆时间序列及其依赖参数在缺失数据下的估计。
缺失数据下的长记忆模型估计:插补还是直接估计?AI 解读 ↓
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Among the most important models for long-range dependent time series is the class of ARFIMA$(p,d,q)$ (Autoregressive Fractionally Integrated Moving Average) models. Estimating the long-range dependence parameter $d$ in ARFIMA models is a well-studied problem, but the literature regarding the estimation of $d$ in the presence of missing data is very sparse. There are two basic approaches to dealing with the problem: missing data can be imputed using some plausible method, and then the estimation can proceed as if no data were missing, or we can use a specially tailored methodology to estimate $d$ in the presence of missing data. In this work, we review some of the methods available for both approaches and compare them through a Monte Carlo simulation study. We present a comparison among 35 different setups to estimate $d$, under tenths of different scenarios, considering percentages of missing data ranging from as few as 10\% up to 70\% and several levels of dependence.