Reduced Form relationship

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最近看东东，发现了Reduced Form relationship。。。。不知道是什么意思，感觉Reduced Form 好像可以出现在计量方面，也可以出现在微观方面，但是具体是什么，然后Reduced Form relationship又是什么，哪位明白的大大可以进来说说，非常感谢的啦。。。

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关键词：relationship relations relation Reduced reduce form relationship Reduced

碰到英文就头晕，期待高手解释我学习~~

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Reduced Form relationship直译就是简约型关系。一般用在计量中解决系统中内生变量问题。这一概念常与结构型模型相对应。举例而言，在结构型中，供给方程为Q=a+bP, 需求方程为Q=c+dP。通过替换，可以将这一系统简化（变为简约型），以方便实证验证。简约型形式为：Q=(cb-ad)/(b-d), P=(c-a)/(b-d)。一般介绍线性方程求解的书里都会有介绍。

reduced form: A set of equations in which all current endogenous variables are expressed in terms of either exogenous variables or pre-determined ...

Definition: The reduced form of an econometric model has been rearranged algebraically so that each endogenous variable is on the left side of one equation, and only predetermined variables (exogenous variables and lagged endogenous variables) are on the right side.

reduced-form relationships that are insensitive to the required subjective choices and consistent with theoretical predictions.

nlm0402 发表于 2009-4-28 09:27
Definition: The reduced form of an econometric model has been rearranged algebraically so that each  ...

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reduced form（简化式）在估计结构方程 structure equations 中出现的专有名词，基本意思是我们将结果方程化简成一个若干简化方程，具体在时间序列分析中（time series analysisi）,每个都是一个当期的内生变量关于自身的滞后变量、其他滞后的内生变量、当期和滞后的外生变量以及扰动项的方程。
a reduced form equation is one expressing the value of a variable in terms of its own lags, lags of other endogenous vari s, current and past values of exogenous vari s and disturbance terms.--------Enders, applied econometric time series.