求翻译：either firm specific effects or period specific effects, there are some occasions when both firm-specific effects and period-specific是什么意思？

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悬赏分：1 - 离问题结束还有

either firm specific effects or period specific effects, there are some occasions when both firm-specific effects and period-specific

问题补充：

匿名	2013-05-23 12:21:38

匿名	2013-05-23 12:23:18

匿名	2013-05-23 12:24:58

匿名	2013-05-23 12:26:38

匿名	2013-05-23 12:28:18

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