/ http://www.slideshare.net/images/logo.gif / 際際滷Share feed for 際際滷shows by User: cmpClau https://cdn.slidesharecdn.com/profile-photo-cmpClau-48x48.jpg?cb=1523532050 Never theorize before you have data. Invariably, you end up twisting facts to suit theories, instead of theories to suit facts.