The world is struck by diseases, disaster or other epidemics every year. It is thus very important to study the collective analysis of such calamities, understand its causes and in turn find solutions. The collection of such data falls under epidemiology. It has become a self-sustaining field of study in the past few decades. This book is an attempt to understand techniques, models and modules revolving around comprehension and collation of relevant data. This book aims to serve as a resource guide for experts, researchers as well as students.