Abstract
Using the blocking techniques and m-dependent methods, the asymptotic behavior of kernel density estimators for a class of stationary processes, which includes some nonlinear time series models, is investigated. First, the pointwise and uniformly weak convergence rates of the deviation of kernel density estimator with respect to its mean (and the true density function) are derived. Secondly, the corresponding strong convergence rates are investigated. It is showed, under mild conditions on the kernel functions and bandwidths, that the optimal rates for the i.i.d. density models are also optimal for these processes.
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References
Bickel P J, Rosenblatt M. On some global measures of the deviations of density function estimates. Ann Statist, 1973, 1: 1071–1095
Bosq D. Nonparametric Statistics for Stochastic Processes: Estimation and Prediction. New York: Springer, 1996
Cai Z W. Strong consistency and rates for the probability density estimators for weakly dependent random variables. J Sys Sci Math Sci, 1990, 10: 360–370
delaPeña V, Giné E. Decoupling: From Dependence to Independence. New York: Springer, 1999
Dudley R M. A Course on Empirical Processes. In: Ecole d’Éte de Probabilites de Saint-Flour XII-1982. Lecture Notes in Math, vol. 1097. Berlin: Springer, 1984, 2–142
Einmahl U, Mason D M. Some universal results on the behavior of increments of partial sum. Ann Probab, 1996, 24: 1388–1407
Einmahl U, Mason D M. An empirical process approach to the uniform consistency of kernel-type function estimators. J Theoret Probab, 2000, 13: 1–37
Einmahl U, Mason D M. Uniform in bandwidth consistency of kernel-type function estimators. Ann Statist, 2005, 33: 1380–1403
Fan J Q, Yao Q. Nonlinear Time Series: Nonparametric and Parametric Methods. New York: Springer, 2003
Födes A. Density estimation for dependent sample. Studia Sci Math Hungar, 1974, 9: 443–452
Giné E, Guillou A. On consistency of kernel density estimators for randomly censored data: Rates holding uniformly over adaptive intervals. Ann Inst H Poincaré Probab Statist, 2001, 37: 503–522
Giné E, Guillou A. Rates of strong consistency for multivariate kernel density estimators. Ann Inst H Poincaré Probab Statist, 2002, 38: 907–921
Giné E, Koltchinskii V, Zinn J. Weighted uniform consistency of kernel density estimators. Ann Probab 2004, 32: 2570–2605
Giné E, Nickl R. Uniform limit theorems for wavelet density estimators. Ann Probab, 2009, 37: 1605–1646
Kallianpur G. Some Ramifications of Wiener’s Ideas on Nonlinear Prediction. In: Masani P, ed. Norbert Wiener, Collected Works, vol. 3. Cambridge: MIT Press, 1981, 402–424
Liebscher E. Strong convergence of sums of φ-mixing random variables. Math Methods Statist, 1995, 4: 216–229
Liebscher E. Strong convergence of sums of α-mixing random variables with applications to density estimation. Stochastic Process Appl, 1996, 65: 69–80
Liu W, Lin Z. Strong approximation for a class of stationary processes. Stochastic Process Appl, 2009, 119: 249–280
Machkouri M E. Kernel density estimation for stationary random fields. Arxiv:1109.2694, 2011
Montgomery-Smith S J. Comparison of sums of independent identically distributed random vectors. Probab Math Statist, 1993, 14: 281–285
Nagaev S V. Large deviations of sums of independent random variables. Ann Probab, 1979, 7: 745–789
Nze P A, Rios R. Density estimation in the L ∞ norm for mixing processes (in French). C R Acad Sci Paris, 1995, 320: 1259–1262
Parzen E. On the estimation of a probability density function and the mode. Ann Math Statist, 1962, 33: 1065–1076
Peligrad M. Properties of uniform consistency of the kernel estimators of density and of regression functions under dependent assumptions. Stoch Stoch Reports, 1992, 40: 147–168
Priestley M B. Non-linear and Non-stationary Time Series Analysis. New York: Academic Press, 1988
Rosenblatt M. Remarks on some nonparametric estimates of a density function. Ann Math Statist, 1956, 27: 832–835
Roussas G G. Nonparametric estimation in mixing sequences of random variables. J Statist Plann Inference, 1988, 18: 135–149
Rüschendorf L. Consistency of estimators for multivariate density functions and for the mode. Sankhya, 1977, 39: 243–250
Sarda P, Vieu P. Empirical distribution function for mixing random variables. Statistics, 1989, 20: 559–571
Silverman B W. Weak and strong uniform consistency of the kernel estimate of a density and its derivatives. Ann Statist, 1978, 6: 177–184
Stute W. The oscillation behavior of empirical processes. Ann Probab, 1982, 10: 86–107
Stute W. A law of the logarithm for kernel density estimators. Ann Probab, 1982, 10: 414–422
Stute W. The oscillation behavior of empirical processes: The multivariate case. Ann Probab, 1984, 12: 361–379
Tong H. Non-linear Time Series: A Dynamical System Approach. Oxford: Oxford University Press, 1990
Wiener N. Nonlinear Problems in Random Theory. Cambridge: MIT Press, 1958
Withers C S. Conditions for linear process to be strongly mixing. Z Wahrsch Verw Gebiete, 1981, 57: 477–480
Woodroofe M. On the maximum deviation of the sample density. Ann Math Statist, 1967, 38: 475–481
Woodroofe M. Discussion of “Density estimates and Markov sequences” by M. Rosenblatt. Cambridge: Cambridge Univ Press, 1970
Wu W B. Strong invariance principles for dependent random variables. Ann Probab, 2007, 35: 2294–2320
Wu W B, Huang Y, Huang Y. Kernel estimation for time series: An asymptotic theory. Stochastic Process Appl, 2010, 120: 2412–2431
Yakowitz S. nonparametric density estimation, prediction and regression for Markov sequences. J Amer Statist Assoc, 1985, 80: 215–221
Yu B. Density estimation in the L ∞ norm for dependent data with applications to the Gibbs sampler. Ann Statist, 1993, 21: 711–735
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Lin, Z., Zhao, Y. Consistency of kernel density estimators for causal processes. Sci. China Math. 57, 1083–1108 (2014). https://doi.org/10.1007/s11425-014-4774-6
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DOI: https://doi.org/10.1007/s11425-014-4774-6