The Accuracy of Systematic Sampling from Conveyor Belts

Abstract

The sampling of coal and similar materials for testing purposes is described, and it is shown how the results of a trial set of observations may be used to calculate the accuracy of a given sampling scheme. The article presents an interesting practical application of the analysis of variance and a new technique based on the theory of time series.

Precision of systematic and random sampling in clustered populations: habitat patches and aggregating organisms

“…A series of studies by statistical sampling theorists from the 1940s onward, fi rst reviewed by Buckland ( 1951 ), extended Cochran ' s idea of a superpopulation model to investigate statistical properties of estimators in spatial populations where systematic sampling was more precise (Quenouille 1949, Das 1950, Jowett 1952, Williams 1956, Hannan 1962, Iachan 1982, Bellhouse and Sutradhar 1988. However, this theoretical approach has not yet produced a robust, unbiased variance estimator generally usable with systematic data sets (see e.g., Cochran 1977 ).…”

Spatio-temporal modeling of 210Pb transportation in lake environments

“…Actually, the concept of SV was used in the scientific literature beforehand as it can be seen in Cressie [14]. It has been called a structure function by Yaglom [15] in the probability context and by Gandin [16] in meteorology, and a mean-squared difference by Jowett [17] in time series. The change with distance on a Cartesian coordinate system of SV is referred to as the SV function, which is explained mathematically as follows by Clark [18].…”

Spotting effect in microarray experiments

“…The structure of the spatial distribution of the signal on a slide can be studied with a geostatistical tool called a variogram ([13,14]). In geostatistics, the variogram has been used to detect departure of stationarity in the data.…”