"Describes the time dimension of the data collection."
"Specifies the type of summary statistic. Summary statistics are a single number representation of the characteristics of a set of values."
"Indicates the statistical software package used in the production/processing/dissemination of the data. Data collection software is not covered in this list."
"Specifies the event happening over the data life cycle that is considered significant enough to document."
"Describes the physical format(s) of the data documented in the logical product(s) of a study unit."