“…In the literature, the importance of covariance structure has been shown in many area, for example, in medical research [1], genetic research [2], [3], [4] and [5], personality research [6], financial market [7], [8] and [9], real estate industry [10], service industry [11], manufacturing industry [12] and [13], software industry [14] and [15], health care industry [16] and even supply chain management [17].…”