A function that returns some value that correlates with the magnitude of
a certain class of data quality problems. Typically, in dataquieR, such
functions return a SummaryTable that features columns with names, that
start with a short abbreviation that describes the specific semantics of
the value (e.g., PCT for a percentage or COR for a correlation) and
the public name of the indicator according to the data quality concept
DQ_OBS, e.g., com_qum_nonresp for item-non-response-rate. A name could
therefore be PCT_com_qum_nonresp.
The object Indicator only contains the name used internally to tag
such functions.
IndicatorAn object of class character of length 1.
Descriptor