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The ARS Model is designed to support the specification of analyses of data in ADaM datasets, which are expected to be "analysis-ready." In analysis-ready datasets, any complex criteria needed to specify predefined groups within grouping factors will usually have been applied to create specific grouping variables. These grouping variables can usually then be referenced in the specification of simple conditions, so compound expressions should generally not be required for the definition of predefined groups within grouping factors. |
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