As I said earlier in technical writing The term
data refers to qualitative or quantitative attributes of a
variable or set of variables. Data (plural of "
datum") are typically the results of measurements and can be the basis of
graphs,
images, or observations of a set of variables. Data are often viewed as the lowest level of
abstraction from which information and then knowledge are derived.
Raw data, i.e. unprocessed data, refers to a collection of
numbers,
characters, images or other outputs from devices that collect information to convert physical quantities into symbols
I go the other way and complain when people say "data are..."
Data (and information) takes the singular. A piece of data and another piece of data become two pieces of data but the data remains a singular noun.
There are times when data, meaning individual statistics, can be analysed in more "granular" (ironic) detail, and I might use plural verbs there but I'd say I pretty much exclusively use it in the singular.