1. A method for making measurements using a vector network analyzer, and for multi-port S-parameter and T-parameter conversion, the method comprising: defining an S-matrix according to: [ b 1 b 2 ⋮ b N ] = [ S 11 S 12 … S 1 ⁢ N S 21 S 22 … S 2 ⁢ N ⋮ ⋮ ⋰ ⋮ S N ⁢ ⁢ 1 S N ⁢ ⁢ 2 … S NN ] · [ a 1 a 2 ⋮ a N ] = [ S ] · [ a 1 a 2 ⋮ a N ] wherein the size of the S-matrix is N×N such that N is the number of ports for a network being analyzed; defining quadrants for the S-matrix by dividing the S-matrix into quadrants wherein each quadrant is a sub-matrix, and such that the divided S-matrix provides a grouping symmetry to a 2-port network; defining a T-matrix according to: [ b 1 b 2 ⋮ b m a 1 a 2 ⋮ a m ] = [ T 11 T 12 … T 1 ⁢ N T 21 T 22 … T 2 ⁢ N ⋮ ⋮ ⋰ ⋮ T M ⁢ ⁢ 1 T M ⁢ ⁢ 2 … T MN ] · [ a ( m + 1 ) a ( m + 2 ) ⋮ a m + n b ( m + 1 ) b ( m + 2 ) ⋮ b m + n ] wherein the size of the T-matrix is M×N such that M=2×m and N=2×n where m is the number of entrance ports and n is the number of exit ports for the network being analyzed; defining quadrants for the T-matrix by dividing the T-matrix into quadrants wherein each quadrant is a sub-matrix, and such that the divided T-matrix provides the same grouping symmetry to the 2-port network to provide a defined relationship between the S- and T-matrices; and making measurements pertaining to a plurality of networks, and manipulating the measurements in accordance with the defined relationship between the S- and T-matrices to result in other measurements pertaining to the plurality of networks.