stratifieras

Stratifieras is a Swedish verb meaning to stratify, or to become stratified. The active infinitive is stratifiera, while stratifieras is the present passive form, used when something is divided into layers or grouped into strata. The concept is used across disciplines to describe the formation or existence of layered structures or hierarchical categories.

In statistics and research, stratifieras refers to dividing a population into subgroups (strata) based on characteristics such as age, sex, income, or region. This underpins stratified sampling, where samples are drawn from each stratum to improve precision and enable meaningful comparisons. In geology and earth science, stratifieras describes the layering of rocks, sediments, or soil profiles into distinct beds, often reflecting historical deposition or diagenetic changes. In ecology and social sciences, stratification refers to layering within systems, such as social hierarchy in human societies or vertical organization of habitats and resources.

Usage considerations include the choice and definition of strata, which influence the validity and efficiency of analyses. Poor or biased stratification can lead to invalid conclusions or reduced statistical power. In formal Swedish writing, stratifieras is commonly used in passive constructions, for example “Data stratifieras efter region och ålder” (Data are stratified by region and age). The term also appears in descriptive contexts to indicate that a process or system naturally forms layers or categories over time or through measurement.