PLACE: 319 Snedecor Hall

SPEAKER:  Jimmy Wright, Department of Statistics, Iowa State University

TITLE:  Investigation of Sampling Designs Excluding Adjacent Units
 

ABSTRACT

Throughout recent years, statistical problems in environmental and ecological research have received a great amount of attention.  One particular problem revolves around the collection and analysis of data from finite populations.  Commonly, in environmental and ecological populations, neighboring units, spatially or sequentially ordered, within a finite population may provide similar information.  In an attempt to obtain the most informative picture of a population, researchers may not want to collect information from similar units within the obtained sample.  Moreover, when sampling from such populations, the selection of dispersed units may result in a reduction in the variance of estimators.

Sampling designs excluding adjacent units within finite one-dimensional populations will be discussed.  Connections between sampling designs for circularly ordered populations, i.e., first and last unit of the population are contiguous, and linearly ordered populations, i.e., first and last unit of the population are not contiguous, will be presented.  Direct search algorithms for identifying sampling designs for circularly ordered populations will be detailed, and a current index of designs for circularly and linearly ordered populations will be presented.

COFFEE:  8:40 a.m., 104 Snedecor Hall

Seminar schedules and abstracts are available via WWW: http://www.stat.iastate.edu