由于这些指标与一个国家的财富密切相关，他们以人均国民生产总值为控制变量来看它是否能够单独解释择偶策略的差别。
Since there is a strong correlation between these variables and a country's wealth, they controlled for GNP per head by measuring whether it alone accounted for the difference in mating strategy.
跟踪转换率并且衡量效果：定义主要表现指标(KPI)、追踪转换率、测量成功是所有推广策略最基础的事情。
Tracking Conversions and measuring success: Defining KPI's (Key Performance Indicator), tracking conversion, and measuring success are ultimately the fundamentals for any promotion strategy.
另一种尚存争议的策略是向消费者提供回扣，以此来达到指定的销售指标。
Another ambiguous tactic is to offer rebates to customers that reach certain sales targets.
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