在英文文献中logged sum of 是什么意思？原文为：thus，we operationalized TMT legitimacy as the logged sum of：（1）the number of top managers with industry experience ；（2）the number of top managers with prior TMT experience ；（3）the number of top managers aged 40 or over；and （4）the number of top managers with advanced degrees 。The logged sum was used because of our belief that legitimacy would be a cumulative function of the individual legitimacy of the individual team members ，subject to diminishing returns。
是不是把四项都取对数然后相加？