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An instance of the Analysis class is created for each analysis and, in each instance:

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• The order attribute contains an integer value that is used to order the referenced grouping factor with respect to other referenced grouping factors (i.e., "1" for the first grouping factor, "2" for the second, etc.).
• The groupingId attribute contains the identifier value of the referenced grouping factor.
• The resultsByGroup attribute contains either "true" or "false" to indicate whether each operation in the analysis method referenced in the methodId attribute of the analysis is (resultsByGroup = "true") or is not (resultsByGroup = "false") expected to produce a separate result value for each of the groups in the referenced grouping factor. In this guide, referenced grouping factors are referred to as "results-by-group" grouping factors when resultsByGroup is "true" an operation result value is expected for each group in the grouping factor. In analyses that generate summary statistics, all referenced grouping factors are usually results-by-group grouping factors.  However, in analyses that generate comparative statistics across groups, some or all of the referenced grouping factors will not be results-by-group grouping factors. Refer to the OperationResult section for more information about the generation of operation result values for groups in grouping factors.