Suppose that the reliability of the fields we decide to weight on is 1.00. This means that the comparison weight for a matched pair would consist solely of agreement weights. On the other hand, suppose the reliability of the fields is 0.00. In this case the comparison weight for the matched pair would consist solely of disagreement weights. As it happens, the reliability falls somewhere in between. Now suppose that every field that we decided to compare always had data present. This would make it possible to make a good estimate of the probability that a given comparison weight occurred in a matched pair by simply using the reliability of the fields (ri). The same argument for using the reliability as an estimate of the probability that a particular comparison weight will occur in a matched pair holds for using the coincidence (ci) as an estimate of the probability that the particular comparison weight will occur in an unmatched pair.
| 5-1.1. | Presence dependence. | ||
| 5-1.2. | Value dependence. | ||
