Aggregation may refer to:

Business and economics

Aggregation problem An ''aggregate'' in economics 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 aggregate ...

(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 the values of multiple rows are grouped together to form a single summary value. Common aggregate functions include: * Average (i.e., arithmetic mean) * C ...

, 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 kind ...

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, in order to increase throughput beyond what a single connection could sustain, to provide redundan ...

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

Packet aggregation {{Use mdy dates, date = March 2019 In a packet-based communications network, packet aggregation is the process of joining multiple packets together into a single transmission unit, in order to reduce the overhead associated with each transmissi ...

, joining multiple data packets for transmission as a single unit to increase network efficiency * Route aggregation, the process of forming a

supernet A supernetwork, or supernet, is an Internet Protocol (IP) network that is formed by aggregation of multiple networks (or subnets) into a larger network. The new routing prefix for the aggregate network represents the constituent networks in a ...

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 The first regional television stations were launched five years after ...

Natural sciences and statistics

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

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

soil structure Soil structure describes the arrangement or the way of soil in the solid parts of the soil and of the pore space located between them. It is determined by how individual soil granules clump, bind together, and aggregate, resulting in the arrangem ...

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

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

platelet Platelets, also called thrombocytes (from Greek θρόμβος, "clot" and κύτος, "cell"), are a component of blood whose function (along with the coagulation factors) is to react to bleeding from blood vessel injury by clumping, thereby ini ...

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

Flocculation Flocculation, in the field of chemistry, is a process by which colloidal particles come out of suspension to sediment under the form of floc or flake, either spontaneously or due to the addition of a clarifying agent. The action differs from pr ...

, a process where a solute comes out of solution in the form of floc 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 or mis-folded proteins aggregate (i.e., accumulate and clump together) either intra- or extracellularly. Protein aggregates have been implicated in a wi ...

, the aggregation of mis-folded proteins

Other uses

* Aggregation (linguistics), 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