4-1.3 Odds of field value missing.
If there is data or no data in one or both of the fields being
compared, this fact alone tells us nothing. We assume that the distribution of blanks and data are the same, whether the comparison is among the matched
or the whole file. The presence and absence frequency ratios are both one (1).
Hence we have the odds that the comparison of a field appears blank in equation (4.4):
 | (4.4) |
