Firstly, speaking of doing it, it is subject definite decision on taking the statistics (BIG data).
The BIG data do not consist of only one data to talk in this site. Therefore it is selection of subject to become the important key.
The subject should be able to get the result that two three and one good are interesting not one. Furthermore, I think that possibly you may do that you do it and thought to be it that this have nothing to do with this really in relations subject.
The question of the method to choose from from several such as a blood type or the favorite color is easy to understand statistics and relations here.
I think that it is interesting when I look seeing from a wide point of view.