# Estimating a Centered Matérn (1) Process: Three Alternatives to Maximum Likelihood via Conjugate Gradient Linear Solvers

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Let denote the candidate correlation matrix of , with inverse-range , that is, the matrix whose element in the row and column is . The only difficulty regarding implementation in the case of no measurement error, of both the hybrid method and CGEM-EV, is the computation of the quadratic form , the so-called "Gibbs energy of associated with a given ".

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Contributed by: Didier A. Girard (June 2015)

(CNRS-LJK and Université Grenoble Alpes)

Open content licensed under CC BY-NC-SA

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References

[1] P. Whittle, "On Stationary Processes in the Plane," *Biometrika*, 41(3–4), 1954 pp. 434–449. doi:10.2307/2332724.

[2] H. Zhang, "Asymptotics and Computation for Spatial Statistics," in *Advances and Challenges in Space-time Modelling of Natural Events* (E. Porcu, J. M. Montero, and M. Schlather, eds.), New York: Springer, 2012 pp. 239–252. doi:10.1007/978-3-642-17086-7_10.

[3] C. G. Kaufman and B. A. Shaby, "The Role of the Range Parameter for Estimation and Prediction in Geostatistics," *Biometrika*, 100(2), 2013 pp. 473–484. doi:10.1093/biomet/ass079.

[4] N. Cressie, "Fitting Variogram Models by Weighted Least Squares," *Journal of the International Association for Mathematical Geology*, 17(5), 1985 pp. 563–586. doi:10.1007/BF01032109.

[5] H. Zhang and D. L. Zimmerman, "Hybrid Estimation of Semivariogram Parameters," *Mathematical Geology,* 39(2), 2007 pp. 247–260. doi:10.1007/s11004-006-9070-8.

[6] D. A. Girard, "Asymptotic Near-Efficiency of the ‘Gibbs-Energy and Empirical-Variance’ Estimating Functions for Fitting Matérn Models to a Dense (Noisy) Series." arxiv.org/abs/0909.1046v2.

[7] C. Janna, M. Ferronato, F. Sartoretto, and G. Gambolati, "FSAIPACK: A Software Package for High Performance FSAI Preconditioning," *ACM Transactions on Mathematical Software*, 41(2), forthcoming.

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