As an alternative to bind_shadow(), you can add specific individual shadow
columns to a dataset. These also respect the dplyr verbs
starts_with, contains, ends_with, etc.
Usage
add_shadow(data, ...)
Arguments
data
data.frame
...
One or more unquoted variable names, separated by commas. These also
respect the dplyr verbs starts_with, contains, ends_with, etc.