Sentence examples for per stratum from inspiring English sources
Per stratum, households were selected by randomly selecting so called 'reference persons' from the State Register.
Per stratum, one county was randomly selected so that in total 15 counties, three from each of five provinces, were included in the sample.
After the survey, a weighting factor is calculated per stratum.
A depth-stratified random survey design with two transects per stratum was followed.
A minimum sample size constraint was also specified (two plots per stratum).
Bootstrap resampling showed that less than 5 samples per stratum (class of soil thickness) provided inconsistent species richness values.
Selecting equal branches per stratum produced approximately similar results to unequal sampling when the SRS estimation technique was used.
From the results of a recent wide investigation (Fattorini et al. 2015), the so-called one-per stratum stratified sampling (OPSS) seems to be a suitable spatial scheme, accomplishing simplicity and efficiency, compared to other schemes investigated.
The use of one-per-stratum stratified sampling provides relevant improvement with respect to the use of simple random sampling without replacement.
To reduce the sampling effort, the initial selection of points is viewed as the first phase of sampling and a subsample of these points is selected in a second phase by means of one-per-stratum stratified sampling (OPSS).
We have investigated the efficiency of one-per-stratum stratified sampling for selecting segments and pixels, where to carry out manual classification and to determine the efficiency of the difference estimator for exploiting auxiliary information at the estimation level.
