
Reliability  Conditions 

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

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

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

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