In the correlation regression analysis of binary normal distribution: TT = TB.

The mathematical concept symbol (matrix) TR is defined as follows in matrix theory: A=(aij) is an n-order square matrix, and the sum of diagonal elements of A is called the trace of A, which is denoted as trA, that is, TRA = A1+A22+ANN.

Terabytes are units of computer storage capacity, and are usually expressed as TB. 1tb = 1024gb = 2 40 bytes.