The book has been written in very simple and graspable language. The research methodologies developed for research work in any field are incorporated in the book. Apart form research workers, the book is very useful for under- graduate, post graduate and doctoral students for their research work as well as for academic understanding. The book devoted on fundamentals and advance concepts of statistical logics. The advanced methodology have been included in the book like regession analysis, path analysis, discriminant function and optimization, etc. The methods have been developed for estimation of total number of branches, leaves, leaf area and consumption of carbon-di-oxide by a tree. And many more.