Two contrasting dispersal models, one purely diffusive and one stratified, were then chosen to simulate colonization for the two contrasting initial genetic structures.
The random sample was stratified for age and region.
A stratified random sample of 1672 individuals was selected for study purposes out of 10 569 residents, stratified by age and gender.
The proof for the case of a continuously stratified fluid between rigid boundaries is straightforward.
The sample was stratified by age and rural-urban environment, and informed consent obtained to take blood specimens from subjects attending phlebotomy centres.
In most analyses, three diagnostic subcategories were used but in some, the category ' non-psychotic disorders ' was stratified.
The velocity and magnetic field are stratified in the vertical direction.
A multi-stage, stratified, random sampling procedure was used to identify the sample.
