This is a general statistics text book written in a modern and advance technical voice. The author bring mathematical, theoretical and conceptual integrity to a body of topics and techniques that is more appropriate to identify influential observation for small and large sample data. This book is very useful for undergraduate and post graduate students as well as researchers who involving their research in the fields statistics, economics, business and management, engineering, biological and physical sciences and social sciences. In this book informal approach provides conceptual richness and develops a subtext of mathematical instruction that achieves a high level of rigor. The text presents a through step-by-step development of fundamental principals.