Editing Epidemiology (section)

== <span style="color: #FFFFFF;">Analyzing</span> ==
{| class="wikitable"
|+ Incidence vs. Prevalence
! Feature !! Incidence (The 'Flow') !! Prevalence (The 'Pool')
|-
| Measure || New cases only || All active cases
|-
| Use Case || To find the 'Cause' (Why are people getting sick?) || To plan 'Resources' (How many beds do we need?)
|-
| Formula || New cases / Population at risk || Total cases / Total population
|-
| Analogy || Water flowing into a bathtub || The total water in the bathtub
|}

'''The Concept of "Confounding"''': This is the "Ghost in the Machine." A confounder is a hidden variable that is linked to both the risk and the disease. If you study "Lighter use" and "Lung cancer," you'll find a link—but the confounder is "Smoking." Analyzing and "Controlling" for these ghosts is the hardest part of epidemiology.
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