STAT 454/854
Winter 2009
Handout #1
Some Commonly Used Terms
1.
Target population
: The complete collection of individuals or elements we intend to
study, defined by the main objective of the study.
2.
Sampling frame
: The complete list of sampling units from which the survey sample
is selected.
3.
Frame population
: The collection of all elements covered by the sampling frame.
4.
Sampled population
: The collection of all possible elements that might have been
chosen in a sample; the collection of all possible elements with nonzero probability
of being selected by the survey; the population from which the sample was taken; the
population represented by the sample.
5.
Observation unit
: Individual elements of the population from which response vari
able is measured.
6.
Sampling unit
: Units we actually sample. It could be one of the two possible cases:
(1) sampling unit is the same as the observation unit (i.e. the individual element), as
in simple random sampling or stratified simple random sampling; (2) sampling unit is a
cluster, as in singlestage or multistage cluster sampling, or stratified cluster sampling.
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 Fall '09
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 multistage cluster sampling, UW Campus Security Office

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