Calendar effects mean that market returns associate with the specific transaction date in stock market, there re two important forms: day of the week effects and month of the year effects.

日历效应是指证券市场出现的在某一特定时间进行交易可以获得超额收益率的现象，它的表现形式主要有星期效应和月份效应。

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To resolve the errors, you must either re-create the filegroup or modify those object definitions to associate them with another filegroup.

若要解决这个错误，必须重新建立档案群组，或者是修改这些物件定义，让它们与其他档案群组建立关联。

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To resolve the errors, you must either re-create the filegroup or modify those object definitions to associate them with another filegroup.

若要解决这个错误，必须重新建立档案群组，或者是修改这些物件定义，让它们与其他档案群组建立关联。

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