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Exogenous and endogenous variables
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<p>In an <a href="/facts/Economics/HYctA2Dn">economic</a> <a href="/facts/Model_(economics)/gNM1Tuct">model</a>, an exogenous variable is one whose measure is determined outside the model and is imposed on the model, and an exogenous change is a change in an exogenous variable.: p. 8 : p. 202 : p. 8 In contrast, an endogenous variable is a variable whose measure is determined by the model. An endogenous change is a change in an endogenous variable in response to an exogenous change that is imposed upon the model.: p. 8 : p. 8 </p><p>The term '<a href="/facts/Endogeneity_(econometrics)/NvtsxNYE">endogeneity</a>' in <a href="/facts/Econometrics/7U52gzHt">econometrics</a> has a related but distinct meaning. An endogenous random variable is <a href="/facts/Correlation/egkluAEm">correlated</a> with the <a href="/facts/Errors_and_residuals/Ef0LgAS4">error term</a> in the econometric model, while an exogenous variable is not. </p>