All kinds of abnormalities are concerned on stock market in the foreign financial documents these years, such as January effect, disposition effect, momentum effect, herd behavior.

近年来，国外财务学界的研究文献大量地关注证券市场的各种异常，如一月效应、处置效应、动量效应、羊群行为等等。

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January effect, a kind of usual phenomenon to statistically analyze the stock market movements, refers to the rate of return in January is often "positive" and is higher than that in other months.

一月效应是从统计学角度分析股市走势的一种惯常现象，指一月份的回报率往往是“正数”，而且会比其他月份为高；相反，十二月的股市回报率很多时候会呈现负值。

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Many shops in China were ordered to shut down as a new law against ivory trade came into effect on January 1st, 2018.

2018年1月1日，一项针对象牙贸易的新法律生效，中国许多商店被勒令关闭。

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We controlled for other well-known fixed calendar (we call them Gregorian anomalies), notably,day of the week effect, like Monday,January effect, Halloween effect, and none of those factors explained results.

VOA: standard.2010.08.05

it takes effect in January. The new law may not go as far as some would like, but the action is historic.

VOA: special.2009.05.27

Since the agreement went into effect in January, some textile factories have gone out of business.

VOA: standard.2010.05.13

What about combining of these two factors, The January Effect in small-caps and the Presidential Cycle?

FORBES: Get Ready For A Turbo Charged January Effect

By December 14, the weekly OBV was above its WMA, confirming the January effect.

FORBES: The Power of Volume

The January effect is the tendency of low price, small-capitalization stocks to outperform in January.

FORBES: Why There May Be A January Effect For Large-Cap Stocks