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Statistical theory
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===Modelling=== [[Statistical model]]s describe the sources of data and can have different types of formulation corresponding to these sources and to the problem being studied. Such problems can be of various kinds: *[[survey sampling|Sampling]] from a finite population *Measuring [[observational error]] and refining procedures *Studying statistical [[multivariate statistics|relations]] Statistical models, once specified, can be tested to see whether they provide useful inferences for new data sets.<ref>Freedman (2009)</ref>
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