Epi/Biostats Flashcards
1
Q
Rate
A
A ratio with a time period, may or may not be a proportion
A*/(a+b)
2
Q
Incidence rate
A
of new cases / # of persons at risk
Probability of acquiring disease
Cohort studies
Attack rate: incidence within an acute health event
3
Q
Prevalence rate
A
cases of disease at time t / total population at time t
Probability that a member of the population has the given condition
Cross sectional studies
