Stratifierade

Stratifierade is a Swedish term used as the past participle of stratifiera, meaning divided into layers or into distinct groups that are relatively homogeneous within each layer or group. The form is used across several fields to describe structured or layered arrangements.

In geology and geomorphology, stratifierade refers to rocks or sediments that display clear layering, or strata, formed by processes such as sediment deposition, volcanic flows, or tectonic forces. Stratification also occurs in soils, where horizontal layers reflect differences in mineral content, grain size, or moisture, affecting drainage and fertility.

In statistics and research methodology, stratifierad (or stratified) describes splitting a population into strata before sampling. Each stratum is sampled separately, and results may be combined with weights to improve estimate precision. Stratified sampling reduces sampling error when strata are internally similar but differ from one another, and it is widely used in surveys and epidemiological studies.

In biology and medicine, stratified refers to tissue or epithelium composed of multiple cell layers, such as stratified squamous epithelium that provides protection in surfaces subject to abrasion. The term also appears in discussions of layered structures in other organisms.

In sociology and demography, stratifierad implies social stratification, where society is organized into hierarchical layers based on attributes like income, education, or occupation. Analyses may be stratified by these factors to study disparities or to control for confounding variables.

See also: stratification, stratified sampling, stratified epithelium.