Aggregation may refer to:

Business and economics

Aggregation problem In economics, an ''aggregate'' is a summary measure. It replaces a vector that is composed of many real numbers by a single real number, or a scalar. Consequently, there occur various problems that are inherent in the formulations that use aggr ...

(economics) * Purchasing aggregation, the joining of multiple purchasers in a

group purchasing organization In the United States, a group purchasing organization (GPO) is an entity that is created to leverage the purchasing power of a group of businesses to obtain discounts from vendors based on the collective buying power of the GPO members. Many GPO ...

to increase their buying power *

Community Choice Aggregation Community Choice Aggregation (CCA), also known as Community Choice Energy, municipal aggregation, governmental aggregation, electricity aggregation, and community aggregation, is an alternative to the investor-owned utility energy supply system in ...

, the joining of geographically contiguous communities to bypass a conventional energy utility monopoly and seek a greener energy service

Computer science and telecommunication

Aggregate function In database management, an aggregate function or aggregation function is a function where multiple values are processed together to form a single summary statistic. Common aggregate functions include: * Average (i.e., arithmetic mean) * Count ...

, a type of function in data processing * Aggregation, a form of

object composition In computer science, object composition and object aggregation are closely related ways to combine objects or data types into more complex ones. In conversation, the distinction between composition and aggregation is often ignored. Common ki ...

in object-oriented programming *

Link aggregation In computer networking, link aggregation is the combining ( aggregating) of multiple network connections in parallel by any of several methods. Link aggregation increases total throughput beyond what a single connection could sustain, and prov ...

, using multiple Ethernet network cables/ports in parallel to increase link speed *

Packet aggregation Packet may refer to: * A small container or pouch ** Packet (container), a small single use container ** Cigarette packet ** Sugar packet * Network packet, a formatted unit of data carried by a packet-mode computer network * Packet radio, a form ...

, joining multiple data packets for transmission as a single unit to increase network efficiency * Route aggregation, the process of forming a supernet in computer networking * Aggregation, a process by which Australian country television markets were combined in the late 1980s and 1990s; see

Regional television in Australia In Australia, regional television is the local television services outside of the five main Australian cities (Sydney, Melbourne, Brisbane, Adelaide and Perth). History 1960s Australia's first regional television station was launched three-and-a ...

Natural sciences and statistics

Aggregation (ethology) {{unreferenced, date=July 2013 In ethology, an aggregation is any form of gathering of Organism, organisms and the process of coming together. In some forms groups of unrelated species might form, in which interaction between members of the aggreg ...

, any gathering of organisms * Aggregation of soil granules to form

soil structure In geotechnical engineering, soil structure describes the arrangement of the solid parts of the soil and of the Pore space in soil, pore space located between them. It is determined by how individual soil granules clump, bind together, and Soil a ...

Particle aggregation Particle agglomeration refers to the formation of assemblages in a suspension (chemistry), suspension and represents a mechanism leading to the functional destabilization of colloidal systems. During this process, particles dispersed in the liquid ...

, direct mutual attraction between particles (atoms or molecules) via van der Waals forces or chemical bonding * The accumulation of

platelet Platelets or thrombocytes () are a part of blood whose function (along with the coagulation#Coagulation factors, coagulation factors) is to react to bleeding from blood vessel injury by clumping to form a thrombus, blood clot. Platelets have no ...

s to the site of a wound to form a platelet plug or a thrombus *

Flocculation In colloidal chemistry, flocculation is a process by which colloidal particles come out of Suspension (chemistry), suspension to sediment in the form of floc or flake, either spontaneously or due to the addition of a clarifying agent. The actio ...

, a process where a solute comes out of solution in the form of floccules or flakes *

Overdispersion In statistics, overdispersion is the presence of greater variability (statistical dispersion) in a data set than would be expected based on a given statistical model. A common task in applied statistics is choosing a parametric model to fit a giv ...

or statistical aggregation, where the variance of a distribution is higher than which we expect. * Aggregation pheromone *

Protein aggregation In molecular biology, protein aggregation is a phenomenon in which intrinsically disordered proteins, intrinsically-disordered or mis-folded proteins aggregate (i.e., accumulate and clump together) either intra- or extracellularly. Protein aggre ...

, the aggregation of mis-folded proteins

Other uses

Aggregation (linguistics) In linguistics, aggregation is a subtask of natural language generation, which involves merging syntactic constituents (such as sentences and phrases) together. Sometimes aggregation can be done at a conceptual level. Examples A simple exampl ...

, a merging of syntactic constituents * ''Aggregation'' (magazine), a 2010–2012 Canadian online magazine

Business and economics

Computer science and telecommunication

Natural sciences and statistics

Other uses

See also