Changes

A very common aim of epidemiological investigation is to estimate the levels of disease in a population. This is of particular importance in the case of [[Surveillance and monitoring of disease|surveillance and disease monitoring systems]], and is commonly the central aim of many descriptive studies.

A very common aim of epidemiological investigation is to estimate the levels of disease in a population. This is of particular importance in the case of [[Surveillance and monitoring of disease|surveillance and disease monitoring systems]], and is commonly the central aim of many [[Descriptive epidemiological studies|descriptive studies]]. There are two main measures of disease frequency - the '''prevalence''' and the '''incidence''' of disease, which each measure different aspects of disease. The '''time to event''' is another measure commonly used, and is closely related to the '''incidence'''.

===Prevalence===

==Prevalence==

===Incidence===

==Incidence==

===Time to event===

==Time to event==

[[Category:Veterinary Epidemiology - Statistical Methods|A]]

[[Category:Veterinary Epidemiology - Statistical Methods|A]]