[Te]
A probabilistic sampling technique used to cluster and isolate sample units when regular spacing is inappropriate for cultural reasons. Stratified random sampling involves dividing the target population or study area into broad zones (e.g. cultivated land, river valley, mountain, etc.) and then randomly selecting sample units so as to give each zone a number of units proportional to its area. Stratified systematic sampling combines the definition of broad zones with the application of a fixed sampling scheme within each zone but the random selection of specific points within the fixed scheme.
