如何用变量代替一个字符串？

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我想用一个命令做GMM估计，但是矩条件很长很长，我想用一个短的变量代替
例如用aa代替"asdfadsfasdfasdfasdfsadf"

然后我在命令字使用aa:
gmm (aa),inst (L1.m L2.ik L2.wnf) winitial(identity) wmat(hac nw opt) twostep

aa的那个地方实际上用那个字符串代替
应该怎么做呢？谢谢哦

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关键词：如何用 字符串 Identity Initial twostep identity 字符串 如何

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Examples

    ---------------------------------------------------------------------------------------------------------------
    Setup
        . webuse klein

    Estimate system by three-stage least squares
        . reg3 (consump wagepriv wagegovt) (wagepriv consump govt capital1)

    ---------------------------------------------------------------------------------------------------------------
    Setup
        . webuse supDem

    Store equations in global macros
        . global demand "(qDemand: quantity price pcompete income)"
        . global supply "(qSupply: quantity price praw)"

    Estimate system, specifying price as endogenous
        . reg3 $demand $supply, endog(price)

    ---------------------------------------------------------------------------------------------------------------
    Setup
        . webuse klein

    Store equations and variable lists in global macros
        . global conseqn "(consump profits profits1 wagetot)"
        . global inveqn "(invest profits profits1 capital1)"
        . global wageqn "(wagepriv totinc totinc1 year)"
        . global enlist "wagetot profits totinc"
        . global exlist "taxnetx wagegovt govt"

    Estimate system, specifying lists of endogenous and exogenous variables; iterate until estimates converge
        . reg3 $conseqn $inveqn $wageqn, endog($enlist) exog($exlist) ireg3

    Modify consumption equation
        . global conseqn "(consump profits profits1 wagepriv wagegovt)"

    Constrain coefficients of wagepriv and wagegovt in consumption equation to be equal
        . constraint 1 [consump]wagepriv = [consump]wagegovt

    Estimate system under constraint
        . reg3 $conseqn $inveqn $wageqn, endog($enlist) exog($exlist) constr(1) ireg3

蓝色 发表于 2013-3-25 00:01
Examples

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非常感谢版主，谢谢