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”。最初出现一月效应的国家是美国，然后其他国家的学者也陆续发现一月效应存在其他股市之中。
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。
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.
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。
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.
有季节性效应(例如股市在一月表现较好，在夏季表现不良)。
There are seasonal patterns (stocks tend to do well in January and poorly during the summer).
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