This is a problem because crucial information gets lost when aggregating data.

这之所以是个问题，是因为在聚合数据时会丢失关键信息。

They also showed that, if they had used aggregate data, they would have concluded there had been a much smaller drop.

他们还表明，如果他们当时研究的是总体数据，结论中的降幅要小得多。

The earlier generation of studies analysed aggregate data, such as weekly sales and prices in a region, not demand from individual consumers or even driving patterns.

前一代研究分析的是总体数据，例如一个地区每周的销售额和价格，而不是单个消费者的需求，甚至是驾驶模式。

By taking it with you to the office, park, or school, you can aggregate data to create your own personal air quality map.

通过将它带到办公室、公园或学校，您可以汇总数据以创建您自己的个人空气质量地图。

Here is also a different way of aggregating this data – the algorithm did significantly better than all of the optometrists and matched the performance of the number one retina specialist.

这是另一种汇集起这些数据的方法——该算法的表现明显好于所有验光师，并与排名第一的视网膜专家的表现相适。