Complete Moment Convergence for Sung s Type Weighted Sums of ρ -Mixing Random Variables
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1 Filomat 32:4 (208), Published by Faculty of Sciences and Mathematics, Uversity of Niš, Serbia Available at: Complete Moment Convergence for Sung s Type Weighted Sums of ρ -Mixing Random Variables Wei Li a, Pingyan Chen b, Soo Hak Sung c a College of Computation Science, Zhongkai Uversity of Agriculture and Engineering, Guangzhou, 50225, P.R. China b Department of Mathematics, Jinan Uversity, Guangzhou, 50632, China c Department of Applied Mathematics, Pai Chai Uversity, Taejon, , South Korea Abstract. In this paper, the authors study a complete moment convergence result for Sung s type weighted sums of ρ -mixing random variables. This result extends and improves the corresponding theorem of Sung [S.H. Sung, Complete convergence for weighted sums of ρ -mixing random variables, Discrete Dyn. Nat. Soc. 200 (200), Article ID , 3 pages].. Introduction and Main Result Let {X n, n } be a sequence of random variables and {a nk, k n, n } an array of real numbers. The limiting behaviors for weighted sums n a have been studied by many authors. We refer to Bai and Cheng [], Chen and Gan [6], Chen et al. [9], Cuzick [], Sung [8, 9], Wu [26], and Zhang [28], and so on. Since many useful linear statistics, such as least squares estimators, nonparametric regression function estimators and jackkfe estimators, are of the form of the weighted sums, so it is interesting and meangful to study the limiting behaviors for them. Recently, Sung [9] obtained a complete convergence result for weighted sums of identically distributed ρ -mixing random variables (we call Sung s type weighted sums). Theorem A. Let p > /α and /2 < α. Let {X, X n, n } be a sequence of identically distributed ρ -mixing random variables with EX = 0 and E X p <. Assume that {a, i n, n } is an array of real numbers with sup n n a q < (.) for some q > p. Then a > εn α <, ε > 0. (.2) 200 Mathematics Subject Classification. Primary 60F5 Keywords. ρ -mixing random variables; Complete convergence; Complete moment convergence; Sung s type weighted sum. Received: 02 February 206; Accepted: 0 September 206 Commucated by Miljana Jovanović Corresponding author: Soo Hak Sung address: sungsh@pcu.ac.kr (Soo Hak Sung)
2 W. Li et al. / Filomat 32:4 (208), Conversely, if (.2) holds for any array {a, i n, n } satisfying (.) for some q > p, then E X p <. Set a = for all i n and n. Then (.) holds for any q > 0 and therefore the weighted sums include the partial sums. Set a = if i n and a nn = n /q for some q > 0. Then (.) holds, meanwhile (.) does not hold for any q > q, and obviously the weights are unbounded in this case. So the weights satisfying (.) are very general. But very few authors continue to study the kind of weighted sums except Zhang [28] who obtained Theorem A for END random variables. In this paper, we will continue to discuss the complete moment convergence for Sung s type weighted sums of ρ -mixing random variables, which is more exact than Theorem A. Firstly, we introduce some concepts. Defition.. () A sequence {Y n, n } of random variables is said to converge completely to a constant θ if P{ Y n θ > ε} <, ε > 0. (2) A sequence {Y n, n } of random variables is said to converge completely to a constant θ in the mean of q-th moment for some q > 0, if E{ Y n θ ε} q <, ε > 0, where and in the following, x means max{0, x}. The concept of complete convergence was introduced by Hsu and Robbins [3] and the one of complete moment convergence is due to Chow [0]. It is easy to show that the complete moment convergence implies the corresponding complete convergence. The complete convergence and complete moment convergence have attracted many authors. We refer to Bai and Su [2], Baum and Katz [3], Deng et al. [2], Li and Spătaru [4], Katz [5], Rosalsky et al. [7], Wang et al. [22], Wang and Hu [23], Wang and Su [25], and their references. Defition.2. Let {X n, n } be a sequence of random variables defined on a probability space (Ω, F, P). For any S N = {, 2, }, define F S = σ(, i S). Given two σ-algebra A and B in F, put EXY EXEY ρ(a, B) = sup E(X EX)2 E(Y EY) : X L 2(A), Y L 2 (B) 2. Define the ρ -mixing coefficients by ρ n = sup{ρ(f S, F T ) : S, T N with dist(s, T) n}, where dist(s, T) = inf{ s t : s S, t T}. Obviously, 0 ρ n ρ n ρ 0 =. Then the sequence {X n, n } is called ρ -mixing if there exists k N such that ρ k <. A number of limit results for ρ -mixing sequence of random variables have been established by many authors. We refer to Bradley [4] for the central limit theorem, Bryc and Smolenski [5], Peligrad and Gut [6], and Utev and Peligrad [2] for the moment inequalities, Chen and Liu [8] (see Remak on page 289) for the complete moment convergence, and Sung [9], Wang et al. [24], and Wu et al. [27] for the complete convergence of weighted sums. Now we state the main result. Some auxiliary lemmas and the proof of the main result will be detailed in the next section.
3 W. Li et al. / Filomat 32:4 (208), Theorem.. Let p > /α, /2 < α and 0 < v < p. Let {X, X n, n } be a sequence of identically distributed ρ -mixing random variables with EX = 0 and E X p <. Assume that {a, i n, n } is an array of real numbers with (.) for some q > p. Then v n (p v)α 2 E max α <, ε > 0. (.3) Conversely, if (.3) holds for any array {a, i n, n } satisfying (.) for some q > p, then EX = 0 and E X p <. Remark.. Theorem A and Theorem. do not discuss the very interesting case of p = /α. We guess that Theorem A and Theorem. are also true when pα =. But, we can not prove them by using the method of the proof of Theorem A or Theorem.. Remark.2. For the case v p, it is still unknown whether Theorem. holds or not under the corresponding moment conditions of Lemma 2.2. Remark.3. Sung [20] gave a generalized method to prove the complete moment convergence. But Theorem. can not follow from the results in Sung [20]. Throughout this paper, C always stands for a positive constant which may differ from one place to another. 2. Lemmas and Proofs To prove the main result, we need the following lemmas. The first one is due to Utev and Peligrad [2]. Lemma 2.. Let r 2, {X n, n } be a sequence of ρ -mixing random variables with EX n = 0 and E X n r < for every n. Then for all n, r r/2 E max C r E r E 2, where C r > 0 depends only on r and the ρ -mixing coefficients. Lemma 2.2. Let p > /α, /2 < α and v > 0. Let {X, X n, n } be a sequence of identically distributed ρ -mixing random variables with EX = 0 and E X p <, if v < p, E X p log( X ) <, if v = p, E X v <, if v > p. Assume that {a, i n, n } is an array of real numbers with a for i n and n. Then (.3) holds. Proof. The proof is similar to that of Chen and Liu [8]. So we omit the detail. Checking the arguments of (2.5)-(2.7) and (2.2)-(2.23) in Sung [9] carefully, we have the following two lemmas.
4 W. Li et al. / Filomat 32:4 (208), Lemma 2.3. Let p > /α and /2 < α. Let Y be a random variable with E Y p <. Assume that {a, i n, n } is an array of real numbers with sup n n a q (2.) for some q > p and a = 0 or a >. Then there exists a positive constant C 0 without depending on Y such that n pα 2 P( a Y > n α ) C 0 E Y p. Lemma 2.4. Let p > /α and /2 < α. Let Y be a random variable with E Y p <. Assume that {a, i n, n } is an array of real numbers with (2.) for some q > p and a = 0 or a >. Then there exists a positive constant C without depending on Y such that n pα rα 2 E a Y r I( a Y n α ) C E Y p, where r > max{2(pα )/(2α ), q} if p 2 and r = 2 if p < 2. Lemma 2.5. Let p > /α, /2 < α and 0 < v < p. Let {X, X n, n } be a sequence of identically distributed ρ -mixing random variables with EX = 0 and E X p <. Assume that {a, i n, n } is an array of real numbers with (2.) for some q > p and a = 0 or a >. Then a > n α x dx <. (2.2) Proof. Set Y (x) = I( a n α x /v ) for i n and n. It is easy to show that P max ( ) a > n α x P max a > n α x /v P i n max a Y (x) > nα x /v. Therefore, in order to (2.2) it is enough to prove that and I 2 = I = n pα 2 P(max i n a > n α x /v )dx < a Y (x) > nα x /v dx <. We first prove that I <. Taking Y = X/x /v in Lemma 2.3, we have I = n pα 2 n pα 2 C P( a X > n α x /v )dx P( a X > n α x /v ) dx E X/x /v p dx = CE X p x p/v dx <.
5 W. Li et al. / Filomat 32:4 (208), Now we prove that I 2 <. Note that by EX = 0, E X p <, (2.) and Hölder s inequality, sup n α x /v max x a EY (x) sup n α x /v x = sup n α x /v x E a X I( a X > n α x /v ) E[( a X p a X p )I( a X > n α x /v )] E X p sup n αp x p/v x E X p n pα 0 a p as n. Therefore, to prove I 2 <, it is enough to prove that I 2 = a [Y (x) EY (x)] > nα x /v /2 <. By Markov s inequality and Lemma 2., we have that for any r 2, I 2 C n pα rα 2 x r/v ( a 2 E Y (x) 2 ) r/2 dx C n pα rα 2 = CI 2 CI 22. x r/v a r E Y (x) r dx If p 2, we choose r such that r > max{2(pα )/(2α ), q}. Then E X 2 < and hence we have I 2 (E X 2 ) r/2 n pαr/2 rα 2 x r/v dx <. Taking Y = X/x /v in Lemma 2.4, we also have I 22 = n pα rα 2 a r E Y nk (x)/x /v r dx C E X/x /v p dx = CE X p x p/v dx <. If p < 2, we choose r = 2. In this case, I 2 = I 22. By Lemma 2.4 again, I 2 = I 22 proof. <. So we complete the Proof of Theorem.. Sufficiency. Without loss of generality, we can assume that n a q n for all n. Set a = a I( a ) and = a I( a > ) for i n and n. Then a = a a. By the monotocity of x and the elementary inequality ( a b 2ε) ( a ε) ( b ε), we have max a 2εn α max a max 2εnα max a εnα max εnα.
6 W. Li et al. / Filomat 32:4 (208), Hence, by the C r -inequality and Lemma 2.2, to prove (.3), it is enough to prove that n (p v)α 2 E max v εnα <, ε > 0. Note that n (p v)α 2 E max v εnα = 0 εnα > n α x /v dx = 0 X i εnα > n α x /v dx X i > εnα > nα x /v dx. εnα > n α x /v dx Hence, we have the desired result by Theorem A and Lemma 2.5. Necessity. Note that v > n (p v)α 2 E max α εvnvα n (p v)α 2 P max 0 α > x dx nvα = ε v n (p v)α 2 P max 0 α > εx dx (2.3) ε v a > 2εn α. Thus, we have E X p < by Theorem A. It remains to show that EX = 0. Set a = for i n and n. Then {a } satisfies (.). We have by (2.3) that > εn α <, ε > 0. (2.4) Since E X p <, we also have by the sufficiency and (2.3) that ( E ) > εnα <, ε > 0. (2.5) Combing (2.4) and (2.5) gives EX = 0. Acknowledgments The authors would like to thank the referee for the helpful comments. The research of Wei Li is supported by National Natural Science Foundation of China (No ). The research of Pingyan Chen
7 W. Li et al. / Filomat 32:4 (208), is supported by the National Natural Science Foundation of China (No. 276). The research of Soo Hak Sung is supported by Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Mistry of Education (204RAA205804). References [] Z.D. Bai, P.E. Cheng, Marcinkiewicz strong laws for linear statistics, Statist. Probab. Lett. 46 (2000), [2] Z.D., Bai, C. Su, On complete convergence for independent sums, Science in China 5 (985), (in Chinese). [3] L.E. Baum, M. Katz, Convergence rates in the law of large numbers, Trans. Amer. Math. Soc. 20 (965), [4] R.C. Bradley, On the spectral density and asymptotic normality of weakly dependent random fields, J. Theoret. Probab. 5 (992), [5] W. Bryc, W. Smolenski, Moment conditions for almost sure convergence of weakly correlated random variables, Proc. Amer. Math. Soc. 9 (993), [6] P. Chen, S. Gan, Limiting behavior of weighted sums of i.i.d. random variables, Statist. Probab. Lett. 77 (2007), [7] P. Chen, T.-C. Hu, A. Volodin, Limiting behavior of moving average processes under ϕ-mixing assumption, Statist. Probab. Lett. 79 (2009), 05. [8] P. Chen, X. Liu, Complete moment convergence for sequence of identically distributed ρ-mixing random variables, Acta Math. Sica 5 (2008), (in Chinese). [9] P. Chen, X. Mao, S.H. Sung, On complete convergence and strong law for weighted sums of i.i.d. random variables, Abstract and Applied Analysis, 204 (204), Article ID 25435, 7 pages. [0] Y.S. Chow, On the rate of moment complete convergence of sample sums and extremes, Bull. Inst. Math. Acta Sica 6 (988), [] J. Cuzick, A strong law for weighted sums of i.i.d. random variables, J. Theoret. Probab. 8 (995), [2] X. Deng, X. Wang, Y. Wu, Y. Ding, Complete moment convergence and complete convergence for weighted sums of NSD random variables, RACSAM 0 (206), [3] P. Hsu, H. Robbins, Complete convergence and the law of large numbers, Proc. Nat. Acad. Sci. U. S. A. 33 (947), [4] D. Li, A. Spătaru, Refinement of convergnece rates for tail probabilities, J. Theoret. Probab. 8 (2005), [5] M. Katz, The probability in the tail of a distribution, Ann. Math. Statist, 34 (963), [6] M. Peligrad, A. Gut, Almost-sure results for a class of dependent random variables, J. Theoret. Probab. 2 (999), [7] A. Rosalsky, L.V. Thanh, A. Volodin, On complete convergence in mean of normed sums of independent random elements in Banach spaces, Stochastic Anal. Appl. 24 (2006), [8] S.H. Sung, Complete convergence for weighted sums of random variables, Statist. Probab. Lett. 77 (2007), [9] S.H. Sung, Complete convergence for weighted sums of ρ -mixing random variables, Discrete Dyn. Nat. Soc. 200 (200), Article ID , 3 pages. [20] S.H. Sung, Complete qth moment convergence for arrays of random variables, J. Inequal. Appl. 203 (203), Article ID 24, pages. [2] S. Utev, M. Peligrad, Maximal inequalities and an invariance principle for a class of weakly dependent random variables, J. Theoret. Probab. 6 (2003), [22] X. Wang, X. Deng, L. Zheng, S. Hu, Complete convergence for arrays of rowwise negatively superadditive-dependent random variables and its applications, Statistics-A Journal of Theoretical and Applied Statistics 48 (204), [23] X.J. Wang, S.H. Hu, Complete convergence and complete moment convergence for martingale differerence sequences, Acta Math. Sin., English Series 30 (204), [24] X. Wang, X. Li, W. Yang, S. Hu, On complete convergence for arrays of rowwise weakly dependent random variables, Appl. Math. Lett. 25 (202), [25] D. Wang, C. Su, Moment complete convergence for B-valued IID random elements sequence, Acta Math. Appl. Sica 27 (2004), (in Chinese). [26] W.B. Wu, On the strong convergence of a weighted sum, Statist. Probab. Lett. 44 (999), [27] Y. Wu, S.H. Sung, A. Volodin, A note on the rates of convergence for weighted sums of ρ -mixing random variables, Lith. Math. J. 54 (204), [28] G.H. Zhang, Complete convergence for Sung s type weighted sums of END random variables, J. Inequal. Appl. 204 (204):353.
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