For both systematic and random sampling, the model performed well in predicting effective area in both the training set and in the test set which was totally independent from the training one.
Here, using Perú as an example country, we examine both systematic and stratified random field-based sampling designs with a LiDAR-estimated national carbon map spanning all 76 million ha of intact and recovering forest land (Fig. 1a) as a model of the country's true carbon stocks (see ''Methods'' section for more detail).
Both the systematic and stratified sampling, however, may be seriously biased in their estimation of the within-limb variance.
Mr. Annan asked for precise areas of the strikes and for assistance to undertake "systematic radiation measurements and sampling".
The 11 sampling strategies belonged to three main categories: simple random sampling, systematic sampling, and stratified sampling.
In this study, we evaluated 11 different sampling strategies that belonged to three main categories: simple random sampling, systematic sampling and stratified sampling.
Systematic or stratified systematic sampling designs are often used and three-stage design in US.
Systematic sampling and testing in a geographically representative sample of large Chinese wLBMs should be undertaken urgently.
This study has certain limitations, being mainly descriptive and, therefore, lacking randomized and systematic sampling.
A virtual hemisphere (12 μm radius) was placed randomly within this area, and systematic sampling was performed at intervals of 100 μm in both X and Y axes.
The aim of this study is to determine the factors that control the spatial variability of chromium in the topsoil at the landscape scale by using a combination of both individual soil pit informations and systematic soil sampling analyses.
