||WE ARE STILL STUDYING ”CARIES”We
aggregate CARIES level information to the higher TOOTH level and create a NEW LEVEL 1 that
we call “TEETH”
(This aggregation is
analogous to the ecological study design – see later)
We disregard the higher
levels PLACE and INDIVIDUAL and disaggregate them to the NEW LEVEL 2 that we call
There are different levels
and we can aggregate or disaggregate.
EVEN WHEN WE ARE
INTERESTED IN A CONCRETE LEVEL (e.g., mouth) WE NEED TO CONSIDER ALL THE LEVELS…
AN ASSOCIATION AT
THE MOUNTH LEVEL COULD IN FACT WE A PLACE EFFECT!!