You define groups by selecting non-overlapping subsets of the domain which, together, cover the whole domain. For each group you combine responses for all units whose domain element (explanatory or independent variable) falls within the group.
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In continuous grouped data the data is collected continuously and in groups. Data collected is in class intervals the actual data values are not visible.
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Grouped data.
Categorical data is the statistical data type consisting of categorical variables or of data that has been converted into that form, for example as grouped data.