Investors are commonly interested in the correlations between different securities, indexes, and indicators. Graphing multiple variables over time helps uncover these correlations (see Figure 14-9).

• 投资者通常对多个证券、指数及指标的相互关系非常感兴趣（参见图14-9），多个变量随时间演变的图形可以帮助投资者揭示这种关系。