Data analysis is a kind of very important question type in line test, which includes a series of knowledge points such as growth, proportion, average, multiple, etc., among which proportion is one of the key points. Today, education will share with you a common way of examining the proportion -- to judge the change of proportion.
1、 Principle analysis
From the basic formula of specific gravity, we know:
When the partial growth rate > the overall growth rate, the partial growth rate - the overall growth rate > 0, that is, the change of proportion > 0, the proportion in the current period > the proportion in the base period, the proportion shows an upward trend;
When the partial growth rate is less than the overall growth rate, the partial growth rate - the overall growth rate is less than 0, that is, the change of proportion is less than 0, the proportion in the current period is less than the proportion in the base period, and the proportion shows a downward trend;
When the partial growth rate = the overall growth rate, the partial growth rate - the overall growth rate = 0, i.e. the change of proportion = 0, the proportion in the current period = the proportion in the base period, and the proportion remains unchanged.
Therefore, when judging the trend of proportion change, it is not necessary to carry out complicated calculation, only to find the growth rate corresponding to the partial value and the overall value, and then compare the growth rate.
【例题1】2018 年，我国全部工业增加值 305160 亿元，比上年增长 6.1%。其中，国有控股企业增加值增长 6.2%。
[example 1] in 2018, the added value of all industries in China was 30516 billion yuan, an increase of 6.1% over the previous year. Among them, the added value of state-owned holding enterprises increased by 6.2%.
Question: in 2018, the proportion of the added value of state-owned holding enterprises in the total industrial added value increased or decreased compared with the previous year?
Part of the value corresponds to the added value of state-owned holding enterprises, with a growth rate of 6.2%. The overall value corresponds to the added value of all industries, with a growth rate of 6.1%. 6.2% > 6.1%, i.e. partial growth rate > overall growth rate, with the proportion rising.
【例题2】2019 年 1-7 月份，高技术服务业投资增长 11.9%，其中，电子商务服务业投资增长 48.0%，环境监测及治理服务业投资增长 36.2%，检验检测服务业投资增长 31.3%，研发设计服务业投资增长 17.8%。
[example 2] from January to July 2019, investment in high-tech service industry increased by 11.9%, of which, investment in e-commerce service industry increased by 48.0%, investment in environmental monitoring and governance service industry increased by 36.2%, investment in inspection and testing service industry increased by 31.3%, and investment in R & D and design service industry increased by 17.8%.
问题：与上年同期相比，2019 年 1-7 月上述 4 类服务业投资占高技术服务业投资的比重上升的有几类?4类服务业投资为部分，高技术服务业投资为整体，整体增长率为11.9%，由材料可知，以上4类增长率均大于11.9%，则比重上升的有4类。
Question: compared with the same period of last year, how many types of investment in the above four types of service industry accounted for the increase in the proportion of investment in high-tech service industry from January to July 2019? Four types of investment in service industry are part of the investment, and the investment in high-tech service industry is the whole, with an overall growth rate of 11.9%. From the materials, we can see that the growth rates of the above four types are greater than 11.9%, and the proportion of the increase is four types.