Data mining, which is belonged to one stage of knowledge
discovery in database process (KDD), is to discover the
items’ relationship and hidden information from a lager
dataset. In this study, we followed the KDD process to data
analyzed. Firstly, we collected relational data form the hospital
information system (HIS). And, based literature reviews, we
identified the independent and dependent variables. After data
pre-processing (data clear, integrated, and transformed), we
used the Weka to analyze our dataset. Lastly, we compared
all of method results to provide our conclusions.