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How do you represent Incident Rate?
(# of new cases during a specific time) / (# of people at risk during that specified time.)
How do you represent Attack Rate (Primary Attack Rate)?
(# of new cases during a short period of time)/ (population that is at risk in the beginning of that time)
How do you represent Secondary Attack Rate?
(# of new causes among the contacts)/ (the total # of contacts)
What’s Prevalence in general?
(# of new & existing cases at a certain time you’re evaluating (point or period))/ (# of people at that certain point in time your evaluating).
What’s Frequency?
(# of cases)/in population