the auxiliary variable X and study variable Y, respectively, C x and C y are the population coefficients of variation due to the auxiliary variable X and study variable Y, respectively, and ρ x y is the popula
By vectorizing the covariance matrix of this vector, we can obtain a difference and sum (diff-sum) coarray, which make use of the complementary between the difference coarray and the sum coarray to construct a larger hole-free area. Based on the diff-sum coarray concept, we then propose...