Context is always "data", never "datum", but "data" is always used as a plural.
E.g.:
However, ISTAT data on agricultural production do not seem very reliable for the last quarter of the nineteenth century...
Export trade data have been obtained...
etc etc.
@Seeds started
London Fixed Gear and Single-Speed is a community of predominantly fixed gear and single-speed cyclists in and around London, UK.
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Context is always "data", never "datum", but "data" is always used as a plural.
E.g.:
However, ISTAT data on agricultural production do not seem very reliable for the last quarter of the nineteenth century...
Export trade data have been obtained...
etc etc.