add_key: Add a key to connect parents to descendants
Description
This function creates a mapping from parent observations to
it's descendants (which useful for merging/joining tables).
Either an existing value in the parent observation can be
recycled to it's descendants or a new column will be
created (if recycle is missing).
Usage
add_key(obs, parent, recycle, key.name, quiet = FALSE)
Arguments
parent
character string. Should be present in the
names of obs.
recycle
character string that matches a variable
name among parent observations.
key.name
The desired column name of the newly
generated key.
quiet
logical. Include message about the keys
being generated?
Value
A list of observations.