Endogenous variables are those that are characteristic of the system under primary study. Exogenous variables are those that may be acting on the system under study. For example, if a scientist is studying patients with migraines then she might measure heights, weights, headache severity and frequency, etc as endogenous variables and food intakes, weather conditions, stress levels, etc as exogenous variables.
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Endogenous variables are important in econometrics and economic modeling because they show whether a variable causes a particular effect. Economists employ causal modeling to explain outcomes (dependent variables) based on a variety of factors (independent variables), and to determine to which extent a result can be attributed to an endogenous or exogenous cause.
'''Exogenous''' (or exogeneous) (from the [[wiki/Greek language|Greek]] words "exo" and "genis", meaning "outside" and "generated") refers to an action or object coming from outside a system. It is the opposite of [[wiki/Endogenous|endogenous]], something generated from within the system.
The exogenous ones, which are set by an outside agent, and the endogenous ones, which occur inside a problem. So if you look at this formula for a wave in one dimension: y = exp(-jkx), where k = 2pi / lambda lambda and x are exogenous while k is endogenous (j and pi are constants).
Endogenous variable is a variable which used in economics for inner side parameters and accelerator coefficient of movement. andExogeneous is outside parameters as taxation,tariff,govt revenues e.t.c
1-Endogenous antigens(En.A) originate by the multiplication of pathogen inside the antigen presenting cell, such as pathogen is intracellular multiply in cytoplasm. 2-En.A presented via M.H.C1 molecule recognized by the CD8 and T-lymphocytes. 3-It includes viral and tumor antigens. 1-Exogenous antigens (Ex.A) originates outside and taken by antigen presenting cells when extracellular pathogen are engulfed and kill inside the phagolysosome. 2-Ex.A presented via M.H.C2 molecule recognized by CD4 and T-Lymphocytes. 3-It includes allergens,bacteria structures (like capsule, flagella e.t.c).