Figure 6.

Matrix representation of true match status of two linked files (File_Master and File_FOI) containing varying frequencies of surname ${\mathbf{M}}_{\gamma =1}$ indicates a true matched pair of records where linkage fields agree (bold on the diagonal), ${\text{M}}_{\gamma =0}$ indicates a true matched pair of records where linkage fields disagree, ${\text{U}}_{\gamma =1}$ indicates a true unmatched pair of records where linkage fields agree (the off diagonal elements in the upper left and lower right quadrants), ${\text{U}}_{\gamma =0}$ indicates a true unmatched pair of records where linkage fields disagree (the lower left and upper right quadrants).