为了支持他们自己所发表的声明，作者(指芝加哥大学的那两个教授)编制了12个收入群体的价格指数，在编制的过程中他们利用了官方的数据和详细的关于不同家庭消费习惯的私人信息。
To back these claims up, the authors constructed price indices for 12 income groups, using official figures and detailed private information on the spending habits of different households.
Malthus论证说，自然群体的数量是呈指数级增长的，而食物供应的增加却是呈线性的。
Malthus argued that natural populations grow at an exponential rate, whereas the increase in food supply is linear.
积极的态度是会传染的。和积极的人相处，积极的态度会让整个群体的动力指数迅速增长。
Positive attitudes are contagious. Connect with other positive people. Multiple positive attitudes lead to exponential motivation as a group.
在就业指数的研究方面，目前已有一些机构开发了一系列就业指数来衡量一个地区或者某类特殊群体的就业现状。
In the aspect of employment index researches, now some institutes have already developed a set of employment indexes to survey the employment situation of some area or some special colony.
和积极的人相处，积极的态度会让整个群体的动力指数迅速增长。
Connect with other positive people. Multiple positive attitudes lead to exponential motivation as a group.
红菜苔叶片叶绿素含量、叶面积指数及比叶重与群体光合速率成正相关；
B. campestris content of leaf chlorophyll, leaf area index , leaf area-weight ratio were positive significantly correlated with the PR.
研究发现在群体水平上，间隔时间分布可以用幂律函数近似刻画，并且，其幂指数和对应人群观看电影的活跃程度之间存在单调的关系。
A monotonous relation between the activity and power-law exponent in the group level is found, and in the individual level, we observe heavy-tailed distribution for.
叶面积指数和叶片氮素含量是决定小麦群体长势的重要生理指标，也是制定栽培管理措施的必要依据。
Wheat LAI and leaf nitrogen content are important physiological indices for determining the growth condition and necessary basis for establishing cultivation and management measure.
此外，中等行距配置群体具有适宜的叶面积指数和较高的剑叶光合速率；
Moreover, there were appropriate leaf area index and higher photosynthetic rate of flag leaf at medium row-spacing treatment.
结果表明，影响纹枯病病情指数的因素包括气象条件和群体条件两大类。
There were two categories of factors, i. e. canopy conditions and climatic factors, which affected sheath blight development.
结果如下： （1） 该群体对褐飞虱的平均抗性指数和平均受害等级均呈连续分布，显示了数量性状的特征， 表明该群体及其亲本对褐飞虱的抗性是由微效多基因控制的数量抗性；
The results showed that:(1)160 tested RIL gave a continuous distribution in their resistance indices to BPH, indicating that the resistance in the tested rice plants to BPH belonged to polygenic type.
结果如下： （1） 该群体对褐飞虱的平均抗性指数和平均受害等级均呈连续分布，显示了数量性状的特征， 表明该群体及其亲本对褐飞虱的抗性是由微效多基因控制的数量抗性；
The results showed that:(1)160 tested RIL gave a continuous distribution in their resistance indices to BPH, indicating that the resistance in the tested rice plants to BPH belonged to polygenic type.
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