An example defining 6 medication groups for
It is a named character vector, where the names are the medication
group unique names (e.g., "Vitamines") and the elements are the medication
group definitions (e.g., "(CATEGORY_L2 == 'VITAMINS')").
The definitions are
R logical expressions using column names and
values that appear in the dataset, as well as references to other
medication groups using the construction "NAME".
An object of class
character of length 6.
In the above example, "CATEGORY_L2" is a column name in the
dataset, and 'VITAMINS' one of its possible values, and which selects all events
that have prescribed ATC codes "A11" (aka "VITAMINS").
Another example is "NotVita" defined as "(!Vitamines)", which selects all
events that do not have Vitamines prescribed.
For more details, please see the acompanying vignette.
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