变异指标是反映总体各单位标志值的差异程度或离散程度指标。它们是总体数量特征的另一个方面的数学描述。要进一步掌握和描述变量分布的数量特征就需要计算变量的离中趋势的代表值(变异指标)，它是与变量分布集中趋势的代表值(平均指标)相辅相成共同反映变量分布规律的一对对立统一的数量代表值。
结果：行PCI治疗的AMI患者心率变异指标有明显改善而对照组无变化。
Results:The heart rate variance indexes of AMI patients received PCI were improved significantly.
存货周转率的另外一个变异指标是存货周转天数，后者意味着存货在多少天里被销售出去。
The variation of inventory turnover ratio is the inventory turnover in days, the latter means the average days the inventory is sold out.
结论：对心肌梗死患者及早行pci，可使患者的心率变异指标显著增加，明显改善患者预后。
Conclusion: Early PCI in AMI patients can increase the heart rate variance indexes significantly and improve the prognosis dramatically.
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