Accession Number : AD0710223

Title :   SIZE-BIASED SAMPLING.

Descriptive Note : Technical rept.,

Corporate Author : FLORIDA UNIV GAINESVILLE DEPT OF INDUSTRIAL AND SYSTEMS ENGINEERING

Personal Author(s) : Scheaffer,R. L.

Report Date : APR 1970

Pagination or Media Count : 27

Abstract : Sampling components which are operating in a system at a fixed time and then observing the lifelengths of these components leads one to a length-biased sample. This concept is generalized to size-biased sampling, which often occurs when sampling multi-sized units such as particles. Estimators of average unit size are presented for the cases in which the underlying size distribution is gamma, Weibull or log-normal. These estimators, when specialized to the length-biased case, are shown to be improvements over some estimators already presented in the literature. Also, the problem of estimating mean life from backward recurrence times is discussed and some improved estimators are presented. (Author)

Descriptors :   (*SAMPLING, DECISION THEORY), (*RELIABILITY, STATISTICAL DISTRIBUTIONS), REPLACEMENT THEORY, LIFE EXPECTANCY, THEOREMS

Subject Categories : Statistics and Probability
      Mfg & Industrial Eng & Control of Product Sys

Distribution Statement : APPROVED FOR PUBLIC RELEASE