Market uncertainty的测量

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请教计算一个变量。Market uncertainty：was measured as the instability of industry sales over the prior five years.Industry sales were regressed against time, and the standard errors of the regression slope coefficients were divided by the mean sales.Larger values indicated greater environmental uncertainty.

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关键词：uncertainty Uncertain certainty Certain market industry standard against errors values

如果我没理解错的话，你把那个regression跑了以后，用斜率的std err除以sales的均值就好了。比如

1. reg sales time
   
2. su sales if e(sample)
   
3. di _se[time]/r(mean)

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2# herbertzhao
谢谢您的解答。

3# goddesslovu

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