modified data model
Merge branch 'master' of github.com:altern/CS519project
modified data model
Revert "modified data model"

This reverts commit 2316a5d7bb76eafa769b0659b6077d31c7fd8cb3.
Merge branch 'master' of github.com:altern/CS519project
modified data model
added R files
Merge branch 'master' of github.com:altern/CS519project
Merge branch 'master' of github.com:altern/CS519project
Merge branch 'master' of github.com:altern/CS519project
removed sql file
Merge branch 'master' of github.com:altern/CS519project
Merge branch 'master' of github.com:altern/CS519project
Added data and data analysis scripts