@property<EOL><INDENT>def derived_columns(self):<DEDENT>
warn_derived_cols()<EOL>try:<EOL><INDENT>return self.derived_attributes<EOL><DEDENT>except AttributeError:<EOL><INDENT>return []<EOL><DEDENT>
Collection of sample attributes for which value of each is derived from elsewhere

:return list[str]: sample attribute names for which value is derived