Serial interval measures
Incubation period of disease
Sensitivity
Specificity
Positive predictive value
.serial inetrval is the time gap between the onset of primary cases and the secondary cases.by collecting information on the whole series if such onsets,we get a distribution of secondary cases from which we can guess the incubation period of disease. ref:park&;s textbook ,22 nd edition,pg no 96
Epidemiology