What are census good for the government to show?
Housing Employment Ethnics diversity Transport Health
Negatives to census?
Doesn’t count homeless people
Millions of households could be missed
What could affect numerator when looking at trends?
Death certification
Disease diagnosis
Coding errors
What could affect denominator when looking at trends?
Pop used
Pop definition
Pop count
Interpretation trends?
Chance variation
Artefactual systematic reasons
Real phenomenon
Uses of cohort?
Comparative study
Measure confounders
Effects of an exposure