the striking of a light beam on a surface; "he measured the angle of incidence of the reflected light" the relative frequency of occurrence of something
The number of new cases of a specific disease occurring during a given time period
The number of new cases (as of a disease) occurring during a particular period of time (as a year)
probability that healthy hosts will develop a disease during a specified period of time; ie the number of new cases of a disease in a population over a period of time
The rate of occurrence of some event, such as the number of individuals who get a disease divided by a total given population per unit of time
The number of new cases of a disease that develop within a specified population over a specified period of time
The number of new cases of a disease occurring in a population over a specific period of time