A data.frame with n*m rows, where n is the number of rows of data
and m is the number of non-target variables. It preserves all other columns
of data, except for the non-target locations, and adds a column y_nt,
which contains the transformed response error relative to the non-targets
Arguments
data
A data.frame object where each row is a single observation
response
Character. The name of the column in data which contains
the response
nt_features
Character vector. The names of the columns in data which
contain the values of the non-targets