Assistments Math 2008-2009 Symb-DFA (318 Students)

This dataset has 16 "students" whose data was determined to be flawed -- one was a teacher, some were getting correct feedback on certain (odd) incorrect answers. These students are removed in ds401 "Assistments Math 2008-2009 Symb-DFA (302 Students)". That dataset should be thus preferred over this one, though this one is being preserved because it may have been used in other analyses. There is a note in an attached file in ds401 providing more detail.