Exogenous

Ask a question about 'Exogenous' Start a new discussion about 'Exogenous' Answer questions from other users Full Discussion Forum

• In an economic
  Economics
  
  File:Ballard Farmers' Market - vegetables.jpgEconomics is the Social sciences that studies the Production theory basics, Distribution , and Consumption of Good and Service ....
   model
  Model (economics)
  
  In economics, a model is a theory construct that represents economic Process by a set of variables and a set of logical and/or quantitative relationships between them....
  , an exogenous change is one that comes from outside the model and is unexplained by the model. For example, in the simple supply and demand
  Supply and demand
  
  ...
   model, a change in consumer tastes or preferences is unexplained by the model and also leads to endogenous
  Endogenous
  
  The word endogenous means "arising from within", the opposite of exogenous....
   changes in demand that lead to changes in the equilibrium
  Economic equilibrium
  
  In economics, economic equilibrium is simply a state of the world where economic forces are balanced and in the absence of external influences the values of economic variables will not change....
   price. Put another way, an exogenous change involves an alteration of a variable that is autonomous, i.e., unaffected by the workings of the model
  Model (economics)
  
  In economics, a model is a theory construct that represents economic Process by a set of variables and a set of logical and/or quantitative relationships between them....
  .

• In linear regression
  Linear regression
  
  In statistics, linear regression is used for two things;Linear regression is a form of regression analysis in which the relationship between one or more independent variables and another variable, called the dependent variable, is modeled by a least squares function, called linear regression equation....
  , it means that the variable is independent of all other response values.

• In biology
  Biology
  
  Biology is a branch of the natural sciences concerned with the study of living organisms and their interaction with each other and their environment ....
  , "exogenous" refers to an action or object coming from the outside of a system. For example, an exogenous contrast agent in medical imaging refers to a liquid injected into the patient intravenously that enhances visibility of a pathology, such as a tumor
  Tumor
  
  A tumor or tumour is the name for a swelling or lesion formed by an abnormal growth of cells . Tumor is not synonymous with cancer. A tumor can be Benign neoplasm, Carcinoma in situ or malignant, whereas cancer is by definition malignant....
  .

• In biology
  Biology
  
  Biology is a branch of the natural sciences concerned with the study of living organisms and their interaction with each other and their environment ....
  , an exogenous factor is any material that is present and active in an individual organism
  Organism
  
  In biology, an organism is any life thing . In at least some form, all organisms are capable of response to stimulus , reproduction, growth and developmental biology, and maintenance of homeostasis as a stable whole....
   or living cell
  Cell (biology)
  
  The cell is the structural and functional unit of all known Life organisms. It is the smallest unit of an organism that is classified as living, and is often called the building bricks of life....
   but that originated outside of that organism, as opposed to an endogenous factor.
• Exogenous factors in medicine
  Medicine
  
  Medicine is the art and science of healing. It encompasses a range of health care practices evolved to maintain and restore health by the prevention and treatment of illness....
   include both pathogens and therapeutics.
• DNA
  DNA
  
  Deoxyribonucleic acid is a nucleic acid that contains the genetics instructions used in the development and functioning of all known living organisms and some viruses....
   introduced to cells via transfection
  Transfection
  
  Transfection is the process of introducing nucleic acids into cells by non-viral methods . The term transformation is preferred to describe non-viral DNA transfer in bacteria and non-animal eukaryotic cells such as fungus, algae and plants....
   or viral infection (transduction
  Transduction (genetics)
  
  Transduction is the process by which DNA is transferred from one bacterium to another by a virus. It also refers to the process whereby foreign DNA is introduced into another cell via a viral vector....
  ) is an exogenous factor.
• Carcinogens are exogenous factors.

• The word exogenous is also used in geology
  Geology
  
  Geology is the science and study of the solid and liquid matter that constitute the Earth. The field of geology encompasses the study of the composition, structural geology, physical properties, dynamics, and History of the Earth of Earth materials, and the processes by which they are formed, moved, and changed....
  . Exogenous processes are all taking place at the outside of the Earth
  Earth
  
  Earth is the third planet from the Sun. Earth is the largest of the terrestrial planets in the Solar System in diameter, mass and density. It is also referred to as the World and Wiktionary:Terra.Note that by International Astronomical Union convention, the term "Terra" is used for naming extensive land masses, rather...
   and all the other planets. Weathering
  Weathering
  
  Weathering is the decomposition of earth Rock , soils and their minerals through direct contact with the planet's atmosphere. Weathering occurs in situ, or "with no movement", and thus should not be confused with erosion, which involves the movement of rocks and minerals by agents such as water, ice, wind, and gravity....
  , erosion
  Erosion
  
  For morphological image processing operations, see Erosion 'For use of in dermatopathology, see Erosion Erosion is the removal of solids in the natural environment....
  , transportation and sedimentation
  Sedimentation
  
  Sedimentation describes the motion of molecules in solutions or particle s in suspension in response to an external force such as gravitation, centrifugal force or electromagnetism....
   are the main exogenous processes.

• In attentional psychology
  Psychology
  
  Psychology is an academic and applied science discipline involving the science study of human mental functions and behavior. Occasionally it also relies on symbolic hermeneutics and critical theory, although these traditions are less pronounced than in other social sciences such as sociology....
  , exogenous refers to attention
  Attention
  
  Attention is the cognitive process of selectively concentrating on one aspect of the environment while ignoring other things. Examples include listening carefully to what someone is saying while ignoring other conversations in a room or listening to a cell phone conversation while driving a car....
   being drawn without conscious intention. An example of this would be attention drawn to a flashing light in the periphery
  Periphery
  
  Generally, a periphery is a boundary or outer part of any space or body....
   of vision
  Visual perception
  
  Visual perception is the ability to interpret information from visible light reaching the eye. The resulting perception is also known as eyesight, sight or vision....
  .

• In Ludology, the study of games, exogenous refers to anything outside the game itself. Therefore an item in a Massive Multiplayer Online Game would have exogenous value if people were buying it with real world money rather than in game currency (though its in game cost would be endogenous
  Endogenous
  
  The word endogenous means "arising from within", the opposite of exogenous....
  ).

See also

• Endogenous
  Endogenous
  
  The word endogenous means "arising from within", the opposite of exogenous....
  
• Endogenous growth theory
  Endogenous growth theory
  
  In economics, endogeny growth theory or new growth theory was developed in the 1980s as a response to criticism of the neo-classical growth model....