Sentence examples for a stratum and a from inspiring English sources

In this stratified cluster survey, each of the three regions was considered a stratum, and a number of clusters per stratum selected randomly using the probability proportionate to size (PPS) technique.

Given a proposed sample size, a minimum allowable number in a stratum and an acceptable risk of observing fewer than this minimum, the number of strata can then be obtained by assuming a Poisson distribution for the number of observations per stratum.

We considered each regional health administration as a stratum and randomly selected a proportion of the primary healthcare units for each regional administration.

The first three big towns in a state were grouped as a stratum and called major towns; all other urban settlements were grouped to form another stratum and called medium towns.

Thus, from our analysis above, we see that the travel times in a homogeneous and anisotropic soil being drained by a network of equally spaced ditch drains underlain by an impervious stratum and receiving a steady rainfall or irrigation recharge are inversely correlated with the recharge rate and the directional conductivities of the soil.

The data were collected in a stratified, cluster-sampled survey, and we accounted for survey design in the analysis using a fixed effect for stratum and a random effect for cluster.

All the strata characteristic of normal skin, stratum basale, stratum spinosum, stratum granulosum and a well-developed stratum corneum were easily identified in the printed skin.

Indeed, besides the plasmatic membrane, Gram-positive bacteria bear a thick wall that consists predominantly of peptidoglycan; Gram-negative bacteria possess a stratified wall constituted of an external membrane, a fine stratum and an inner peptidoglycan-based plasmatic membrane.

Woody species at different development stages are compared between a forest stratum and the adjacent grassland stratum.

Each recurrence is modelled as a different stratum and each stratum is treated as marginal data.

We differentiate between a subaerial erosion of exposed hinterland strata and a submarine abrasion of sediments.