Wikipedia 10K Redux by Reagle from Starling archive. Bugs abound!!!

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StatisticalUnit

back to StatisticalModels

There are different ways to study a unit and different names applied in different statistical disciplines. 

#We may be interested in a ''unit'' because we intend to generalize from observations on a few units to a StatisticalAssembly of units. Opinion polling and SurveySampling provide well known examples of this type of research.
#We may be interested in the dynamics of a ''unit'', how its observable characteristics change from time to time. Economic studies of business firms provide an example of this type of research. 
#We may be interested in the internal functioning of a ''unit'' which we can characterize as a StatisticalAssembly. This kind of research often involves interference with the unit such as subjecting it to a treatment or even dissection, in some cases.
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DickBeldin