References in periodicals archive ?
We applied a 1--[km.sup.2] grid to a 1:50,000-scale map of the park and randomly selected 32 cells as pellet group transect sampling units. Two parallel transect lines were established in a north-south orientation with at least 100 m separation between transect lines within most sampling units.
Press can be configured with automatic sampling units to measure tablet weight, tablet thickness, and tablet hardness, with real-time feedback for fully automated production.
For equal-effort sampling and proportional sampling we simulated 3 ha sampling units, a size equivalent to a 100 m radius point count.
We can use a simple random sample if we can easily identify the sampling units and if the population is small and homogeneous.
This paper offers a method to test statistically for fuzziness of the partitions in cluster analysis of sampling units that can be used with a wide range of data types and clustering methods.
Sampling units included four of the eight cities with populations over 25,000 (Des Moines, Dubuque, Cedar Rapids, and Council Bluffs) and 10 rural areas (counties or the rural part of urban counties) that were selected on a stratified regional basis.
Historically, the Bureau of Labor Statistics has used the Office of Management and Budget's (OMB) definition of Metropolitan Areas first to determine the geographic boundary between the metropolitan and nonmetropolitan areas of the United States for the CPI,(1) and second to divide the metropolitan United States into geographic sections called primary sampling units (hereafter, called sampling units).
Based on enrollment data, 390 sampling units were created from 478 public schools that included seventh grade students in 1986; units varied in size from 88 to 176 seventh grade students and were created by aggregating small schools, dividing large schools, and leaving intact the schools that fell within the desired range.
In Kenya and Senegal, the researchers stratified primary sampling units as poor (informal slums) or nonpoor (formal settlements), then chose an equal number from each category; because primary sampling units in Nigeria could not be categorized, the researchers randomly selected a representative sample.
Exponent k of the negative binomial distribution: the exponent k is a suitable dispersion index when the size and numbers of sample units are the same in each sample, since this is frequently influenced by the size of the sampling units. This parameter is an inverse measure of the degree of aggregation, where in this case negative values indicate a normal or uniform distribution, positive values near zero indicate an aggregated dispersion and values greater than eight indicated a random dispersion (Elliot 1977; Southwood 1978).