  The purpose of writing this book is to suggest some improved estimators using
auxiliary information in sampling schemes like simple random sampling and
systematic sampling.
  This volume is a collection of five papers. The following problems have been
discussed in the book:
  In chapter one an estimator in systematic sampling using auxiliary
information is studied in the presence of non-response. In second chapter some
improved estimators are suggested using auxiliary information. In third chapter
some improved ratio-type estimators are suggested and their properties are
studied under second order of approximation.
  In chapter four and five some estimators are proposed for estimating unknown
population parameter(s) and their properties are studied.
  This book will be helpful for the researchers and students who are working in
the field of finite population estimation.
