股票评价是对股票的对股票投资价值和投资风险的总体评估。 股票评价的主要方法是计算其价值，然后和股票市价比较，视其低于、高于或等于市价，决定买入、卖出或继续持有。
这种理论能精确指出一组对象之间的相关性，比如可以评价一只股票和其他股票之间有何联系。
It can pinpoint correlations between groups of objects, so it can assess how one stock is linked to other groups of stocks, for instance.
我让他们列出10只分析师一年前评价最高的股票。
I asked them for the 10 stocks that analysts rated most highly a year ago.
通用汽车的股票在周四自由落体，在某评价机构威胁要调低其评价后，股价下降了31%。
General Motors' shares went into free-fall on Thursday, dropping 31% after a rating agency threatened to downgrade its debt.
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