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在实际展示仪表板的过程中，经常需要展示销售情况的数据，比如销售额，销售利润等。这些都是在数据集或数据模型中直接存在的数据字段，可以直接拖拽使用。
但当我们希望在仪表板中展示诸如总销售利润率时，就无法直接拖拽使用了，因为这类字段无法通过拖拽自动聚合，此时就需要一种更强的计算能力。
产品当中从数据模型、数据集到仪表板中均支持通过分析表达式添加新指标，这样既可以在数据准备阶段提前把需要的指标创建好，以供多个仪表板使用，也可以仅为当前仪表板添加并使用。
本章将为您介绍在仪表板中如何添加此类具备更强计算能力的指标，从而帮助我们进行更加深入的数据挖掘和展示分析。