“…It is well known that associated sequences play an important role in a wide variety of areas, including multivariate statistical analysis, reliability theory and life sciences. One can refer to Newman (1980); Newman and Wright (1982); Newman (1984Newman ( , 1990, Cox and Grimmett (1984), Birkel (1988aBirkel ( ,b, 1989, Roussas (1991Roussas ( , 1993Roussas ( , 1994Roussas ( , 1995Roussas ( , 1996, Yang (2001); Yang et al (2008), and Vronskii (1999) for further comprehension. The concept of association, however, is strictly stronger than the one of positive association in Definition 1.1, as mentioned in Xing and Yang (2010).…”