Wittmann Type Strong Laws of Large Numbers for Blockwise m-negatively Associated Random Variables
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1 Journal of Mathematical Research with Applications Mar., 206, Vol. 36, No. 2, pp DOI:0.3770/j.issn: Wittmann Type Strong Laws of Large Numbers for Blockwise m-negatively Associated Random Variables Guohui ZHANG,, Henar URMENETA 2, Andrei VOLODIN 3. College of Mathematics and Statistics, Hengyang Normal University, Hunan 42008, P. R. China; 2. Department of Statistics and Operations Research, Public University of Navarre, 306 Pamplona, Spain; 3. Department of Mathematics and Statistics, University of Regina, Regina, Saskatchewan S4S 0A2, Canada Abstract In this paper, Wittmann type strong laws of large numbers for blockwise m- negatively associated random variables are established which extend and improve the related known works in the literature. Keywords strong laws of large numbers; blockwise m-negatively associated random variables MR(200) Subject Classification 60F5. Introduction Let {Ω, I, P } be a probability space. In the following, all random variables are assumed to be defined on {Ω, I, P }. Definition. A finite family {X, X 2,..., X n } of random variables is said to be negatively associated (NA) if for any disjoint subsets A, B {, 2,..., n} and any real coordinatewise nondecreasing functions f : R a R and g : R b R, where a = (A) and b = (B), Cov(f(, i A), g(x j, j B)) 0, whenever the covariance exists. An infinite family of random variables is said to be NA if every its finite subfamilies are NA. We refer to the paper by Joag-Dev and Proschan [] where many examples and properties of NA random variables are presented. Definition.2 Let m be a positive integer. A sequence of random variables {X n, n } is said to be m-negatively associated (m-na) if for any finite subset of index A = {i, i 2,..., i n } N = {, 2, 3,...}, where n 2, such that i k i j m for all k j n, we have that {,..., n } is NA. The concept of m-na random variables was introduced by Hu et al. [2] where the complete convergence for arrays of rowwise m-na random variables is studied. Received February 7, 205; Accepted November 9, 205 Supported by the National Natural Science Foundation of China (Grant No. 276). * Corresponding author address: zhangghui230@63.com (Guohui ZHANG)
2 240 Guohui ZHANG, Henar URMENETA and Andrei VOLODIN Definition.3 Let {n i, i } be an arbitrary strictly increasing sequence of natural numbers. A sequence of random variables {X n, n } is said to be blockwise negatively associated (blockwise NA) with respect to {n i, i } if the sequence {X n, n i n < n i } of finite families of random variables is NA for each i. The concept of blockwise NA random variables was introduced by Nezakati [3] where Marcinkiewicz strong law and classical strong law of large numbers for a sequence of blockwise NA are obtained. The blockwise structure has been considered for several class of random variables in the literature, for blockwise independent and blockwise orthogonal random variables in Gaposhkin [4], for double arrays of blockwise m-dependent random variables in Stadtmüller and Thanh [5], for blockwise martingale difference sequences in Rosalsky and Thanh [6], for blockwise and pairwise m-dependent random variables in Le and Vu [7], and so on. The following notion seems to be new. Definition.4 Let m be a positive integer, {n i, i } be an arbitrary strictly increasing sequence of natural numbers. A sequence of random variables {X n, n } is said to be blockwise m-negatively associated (blockwise m-na)with respect to {n i, i } if the sequence {X n, n i n < n i } is m-na for each i. The concept of blockwise m-na is a natural extension from m-na and blockwise NA. Wittmann Strong law Wittmann [8] proved the following strong law for a sequence of independent random variables {X n, n }. that Let p and {a n, n } be an increasing sequence of strictly positive real numbers such (i) a 2p n E( X n 2p ) <, (ii) a 2 n (a 2 n a 2 n ) p (E(Xn)) 2 p <. Then we have a n n ( E ) = 0 a.s. i= In this paper, we obtain Wittmann type strong law of large numbers for a sequence of blockwise m-na random variables which extend and improve the related results from Nezakati [3] for blockwise NA random variables, from Wittmann [8] for independent random variables, and from Liu and Wu [9] for NA random variables. In the following section we present the main results and an important lemma necessary to prove our results. Throughout this paper, C will represent positive constant which may change from one place to another, I(A) will represent the indicator function of a set A and {n i, i } will be an arbitrary strictly increasing sequence of natural numbers. 2. Main results
3 Wittmann type strong laws of large numbers for blockwise m-negatively associated random variables 24 For any {n i, i } as above, we introduce the following notations: I k = {i : [2 k, 2 k+ ) [n i, n i+ ) }, ν k = (I k ), [l ki, r ki ) = [2 k, 2 k+ ) [n i, n i+ ) if i I k, ψ(n) = 0jk ν j if n [2 k, 2 k+ ). It is easy to see, for any {n i, i }, that ψ(n) = O(n) and that ψ(n) = O() if inf n i+ /n i >. i In order to prove our main results, we present the following lemma. Lemma 2. Let p >, {X n, n } be a sequence of blockwise m-na random variables with respect to {n i, i } with E X n p < for all n and EX n = 0 for all n. Then, for every ε > 0 and k, (i) If < p 2, (ii) If p > 2, { P n<+ { P { P n<+ n (iii) If < p 2, { P (iv) If p > 2, i= n 2 k n<2 k+ i=2 k } n i= n 2 k n<2 k+ i=2 k } } + ε p 2 3 p m p E p. i= 2ε p( 5p) { pm + p E p + ln p i= } 2 k+ ε p 2 3 p (mv k ( + i= i=2 k E p. EX 2 i /2 }. 2ε p( 5p(mvk { 2 k+ ( 2 k+ /2 } E p + EXi 2. ln p i=2 k i=2 k Proof We prove (iii) and (iv). The proofs of (i) and (ii) are similar to those of (iii) and (iv), respectively. Therefore, the proofs of (i) and (ii) are omitted. By Markov s inequality, C r -inequality, Theorem 2 of Shao [0], we have { n } ( P ε p n E 2 k n<2 k+ 2 k n<2 k+ i=2 k i=2 k ( ε p n E l kj n<r kj ε p v p k ε p v p k E E i=l kj ( l kj n<r kj n i=l kj ( m l kj n<r kj l=0 l kj in
4 242 Guohui ZHANG, Henar URMENETA and Andrei VOLODIN ε p (mv k ) m p Theorem 2.2 l=0 ( E ε p (mv k ) m p l=0 ε p (mv k ) m p l=0 2 k+ ε p 2 3 p (mv k l kj n<r kj (2 3 p l kj in l kj in<r kj 2 ( 5p) ( p ln p l kj in<r kj i=2 k E p, < p 2, E p), < p 2 ( E p + l kj in<r kj EX 2 i 2ε p( 5p(mvk { 2 k+ ( 2 k+ /2 } E p + EXi 2, p > 2. ln p i=2 k i=2 k 2 ), p > 2 Let {X n, n } be a sequence of blockwise m-na random variables with respect to {n i, i } and EX n = 0 for all n, and let {b n, n } be a positive strictly increasing sequence such that b n = and 0 < a = inf b n i b n i i+ If there exist constants p, q such that 0 < p 2, pq > 2, E X n pq < and sup b ni b n i+ = c <. (2.) i n E X n pq <, (2.2) n (b p n b p n ) (q ) (E X n 2 q/2 <, (2.3) then b n n X k = 0 a.s. (2.4) Proof For any positive integer n n 2, there exists a positive integer k 3 such that n <. Note that b n b nk ab nk > 0 by (2.) and k as n, we have n b n n X j b n k X j + j=2 b nj b nk ( b nj n j i=n j ) + ab nk n< n j= X j. (2.5) Obviously the first term on the right-hand side of (2.5) converges to zero a.s.. Utilizing (2.) and similar method in the proof of Theorem of Nezakati [3], we have k sup k 3 j=2 b nj b nk < and b nj b nk = 0, for every j. Then by Toeplitz Lemma we have that the second term on the right-hand side of (2.5) almost
5 Wittmann type strong laws of large numbers for blockwise m-negatively associated random variables 243 sure converges to zero if we prove that b nk n k j= X j = 0 a.s. Therefore, in order to prove (2.4), we only need to prove that b nk n< From Lemma 2. (ii), we have for any ε > 0 ( P b nk n< n j= X j n j= X j ) = 0 a.s. (2.6) { nk ( n k q/2 } C E X j pq + E X j 2. (2.7) j= j= Let τ i = inf{k N, i }. By (2.) and (2.2) we have, n k E X j pq E X j pq j= = E X j pq E X j pq C k=τ j n τj c pq(k τ j) k=τ j j E X j pq <. (2.8) Since 0 < p 2, pq > 2, we deduce that 0 < p/2 and q >. Set b 0 = 0. By C r -inequality and Hölder inequality and (2.3), we have = = ( nk E X j 2 j= { nk C q/2 ( nk E X j 2q/2 (b p j bp j )(q )/q (b p j bp j ) (q )/q (E X j 2 /2} q ( nk (b p j bp j ) (q ) (EXj 2 q/2)( ) (q ) (b p j bp j ) ( nk (b p j bp j ) (q ) (EXj 2 q/2) ((b p j bp j ) (q ) (EXj 2 q/2 ) k=τ j j (b p j bp j ) (q ) (EX 2 j q/2 <. (2.9) Thus, (2.6) holds by virtue of Borel-Cantelli lemma and (2.7) (2.9). When < pq 2, we have the following theorem.
6 244 Guohui ZHANG, Henar URMENETA and Andrei VOLODIN Theorem 2.3 Let {X n, n } be a sequence of blockwise m-na random variables with respect to {n i, i } and EX n = 0 for all n, and let {b n, n } be a positive strictly increasing sequence satisfying (2.). If there exists a constant p such that < p 2, E X n p <, and then (2.4) holds. n E X n p <, (2.0) Proof In the same way as used in Theorem 2.2, we only need to prove that (2.6) holds. Utilizing Lemma 2.(i), (2.0) and similar method in the proof of (2.8), we have for any ε > 0 that ( P b nk n< n j= X j ) By virtue of Borel-Cantelli lemma, (2.6) holds. C n k j= E X j p <. Corollary 2.4 Let {X n, n } be a sequence of blockwise m-na random variables with respect to {n i, i } and EX n = 0 for all n, and let {b n, n } be a positive strictly increasing sequence satisfying (2.). If there exist constants p, q such that 0 < p 2, q, E X n pq < for all n, and then (2.4) holds. Proof For 0 < p 2, q, we have n (b p n b p n ) (q ) E X n pq <, (2.) n n (b p n b p n ) (q ). (2.2) If pq > 2, note that (EX 2 nq/2 E X n pq. By (2.) and (2.2), (2.2) and (2.3) hold, therefore, (2.4) holds from Theorem 2.2. If 0 < pq 2, by (2.) and (2.2), (2.0) holds, therefore, (2.4) holds from Theorem 2.3. If we take b n = n α with α > 0. By Theorem 2., Corollary 2.4, and we have the following two corollaries. {nαp (n ) αp } n αp = /(αp), Corollary 2.5 Let {X n, n } be a sequence of blockwise m-na random variables with respect to {n i, i } with EX n = 0 for all n and α a real number with α > 0. Suppose that 0 < a = inf i nα i n α i+ sup If there exist some p, q such that 0 < p 2, pq > 2, E X n pq <, i n αpq E X n pq < n α i n α i+ = c <. (2.3)
7 Wittmann type strong laws of large numbers for blockwise m-negatively associated random variables 245 and then n {+q(αp )} ( E X n 2q/2 <, n α n X k = 0 a.s. (2.4) Corollary 2.6 Let {X n, n } be a sequence of blockwise m-na random variables with respect to {n i, i } and EX n = 0 for all n and α a real number with α > 0. Suppose that (2.3) holds and there exist some p, q, with 0 < p 2, q, such that E X n pq < and then (2.4) holds. n {+q(αp )} E X n pq <, By using (iv) of Lemma 2. and the same way as used in Theorem 2.2, we can prove the following two theorems. Theorem 2.7 Let {X n, n } be a sequence of blockwise m-na random variables with respect to {n i, i } and EX n = 0 for all n, and let {b n, n } be a positive strictly increasing sequence such that b n = and 0 < a = inf b 2 i ib 2 i+ sup Suppose that, for some p, q such that 0 < p 2, pq > 2, E X n pq <, and n E X n pq <, Then i ( n b p n b p ) (q ) ( n E Xn 2q/2 <. b n (ψ(n)) (pq )/(pq) n X k = 0 a.s. b 2 ib 2 i+ = c <. (2.5) Theorem 2.8 Let {X n, n } be a sequence of blockwise m-na random variables with respect to {n i, i } and EX n = 0 for all n, and let {b n, n } be a positive strictly increasing sequence satisfying (2.5). Then Suppose that E X n p < for some p ( < p 2), and n E X n p <. b n (ψ(n)) (p )/p n X k = 0 a.s.
8 246 Guohui ZHANG, Henar URMENETA and Andrei VOLODIN Corollary 2.9 Let {X n, n } be a sequence of blockwise m-na random variables with respect to {n i, i } such that + / > and EX n = 0 for all n. Suppose that, for some p, < p 2, such that E X n p = O(), n. Then, for all δ >, n X (n log n(log log n) δ ) /p k = 0 a.s. Remark 2.0 (i) Theorems 2.2 and 2.3 extend and improve the related known works in Wittmann [8] for independent random variables. (ii) Theorems 2.2 and 2.3, Corollaries extend the related known works in Liu and Wu [9] for NA random variables. (iii) Let p = 2, m =, from Theorems 2.3, 2.7 and Corollary 2.9, we get Theorems, 2 and Corollary in Nezakati [3], respectively. Acknowledgements We thank the referees for their time and comments. References [] K. JOAG-DEV, F. PROSCHAN. Negative association of random variables with application. Ann. Statist., 983, (): [2] T. C. HU, C. Y.CHIANG, R. L. TAYLOR. On complete convergence for arrays of rowwise m-negatively associated random variables. Nonlinear Anal., 2009, 7: [3] A. NEZAKATI. Limit theorems for sequences of blockwise negatively associated random variables. Theory Probab. Appl., 20, 55(2): [4] V. F. GAPOSHKIN. On the strong law of large numbers for blockwise independent and blockwise orthogonal random variables. Theory Probab. Appl., 994, 39: [5] U. STADTMÜLLER, L. V. THANH. On the strong it theorems for double arrays of blockwise m- dependent random variables. Acta Math. Sin. (Engl. Ser.), 20, 27(0): [6] A. ROSALSKY, L. V. THANH. Some strong laws of large numbers for blockwise martingale difference sequences in martingale type p Banach spaces. Acta Math. Sin. (Engl. Ser.), 202, 28(7): [7] V. T. LE, N. A. VU. A strong it theorem for sequences of blockwise and pairwise m-dependent random variables. Bull. Korean Math. Soc., 20, 48 (2): [8] R. WITTMANN. An application of Rosenthal s moments inequality to the strong law of large numbers. Statist. Probab. Lett., 985, 3: [9] Lixin LIU, Rong WU. Strong law of large numbers and complete convergence for sequences of NA random variables. Chinese J. Appl. Probab. Statist., 200, 7(3): [0] Qiman SHAO. A comparison theorem on moment inequalities between negatively associated and independent random variables. J. Theoret. Probab., 2000, 3(2):
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