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Estimating variances in time series linear regression models using empirical BLUPs and convex optimization
Martina Hančová, Gabriela Vozáriková, Andrej Gajdoš, Jozef Hanč
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We propose a two-stage estimation method of variance components in time series models known as FDSLRMs, whose observations can be described by a linear mixed model (LMM). We based estimating variances, fundamental quantities in a time series forecasting approach called kriging, on the empirical (plug-in) best linear unbiased predictions of unobservable random components in FDSLRM. The method, providing invariant non-negative quadratic estimators, can be used for any absolutely continuous probability distribution of time series data. As a result of applying the convex optimization and the LMM methodology, we resolved two problems - theoretical existence and equivalence between least squares estimators, non-negative (M)DOOLSE, and maximum likelihood estimators, (RE)MLE, as possible starting points of our method and a practical lack of computational implementation for FDSLRM. As for computing (RE)MLE in the case of $ n $ observed time series values, we also discovered a new algorithm of order 𝒪(n), which at the default precision is 10⁷ times more accurate and n² times faster than the best current Python(or R)-based computational packages, namely CVXPY, CVXR, nlme, sommer and mixed. We illustrate our results on three real data sets - electricity consumption, tourism and cyber security - which are easily available, reproducible, sharable and modifiable in the form of interactive Jupyter notebooks.
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