非参数ACD模型不依赖条件均值的函数形式和误差项的分布形式，更具有一般意义。

Because the nonparametric ACD model does not rely on the functional form of (conditional) mean value and the error distribution form, it has more typical implication.

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使用非参数估计方法给出条件密度和条件均值的估计，在此基础上给出参数的广义矩估计。

The conditional density and the conditional mean are estimated by nonparametric method. Then the estimator of the parameter is proposed by the generalized method of moments.

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梅奥和他的同事针对这种情况引入了休息机制，同时提高了工作条件，这之后，他们发现一年以内，人力资源流动率降低了，与公司其他部门的平均值持平。

After introducing rest breaks and other improvements in working conditions, Mayo and his colleagues found that within a year the Labour turnover rate fell to the average elsewhere in the company.

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