Physically Disabled people are familiar to every class, culture and society. The number of moderately and severely disabled persons was 250 to 300 million in 1990 (Helander, 1993). Stigma and discrimination against people with disabilities has always been a problem....

This book intended to cover the overview of unequal probability sampling and Generalization of Murthy\"\"s (1957) estimator. The researcher in the field of survey sampling can get benefit from this book. This book covers an overview of the unequal probability sampling, work done for Horvitz and Thompson (1952), Raj(1956) and Murthy (1957) estimators....