Attribute types In order to generate correct results, all attributes must be
the right type; either nominal or numerical. When opening the file in WEKA,
all attributes had automatically been assigned to be numerical. In order to test
the data set, using both Naive-Bayes and J48 algorithm, the “goal” attribute (in
this case, num) that the tests will run on, must be a nominal type. Therefore, all
attributes were assigned a type before any tests were run. Once this was done, the
home data set was saved as an ar!-file.