Table 5: Conditions given for the calculation of four types of intermethod reliability (formula: reliability = (a/b) × 100).

ReliabilityConditions

Totala = the smaller frequency of “positive” identification by one test
b = the larger frequency of “positive” identification by the other test

Point by pointa = the number of cases with the same identification from both tests
b = the total number of cases

Occurrencea = the number of cases who tested “positive” in both tests
b = the number of cases who tested “positive” at least in one test

Nonoccurrencea = the number of cases who tested “negative” in both tests
b = the number of cases who tested “negative” at least in one test