"Judging the change in weight" is a common test knowledge point in data analysis, but many students only know the most basic form of examination, and once the question is slightly deformed, they will not know where to start. Therefore, if you want to truly apply this knowledge point freely, you need to analyze it comprehensively and understand it thoroughly.
Body part.
The following will take you through a few questions to learn more about the several forms of "judging the change in proportion".01 Given the partial growth rate and the overall growth rate, let's judge whether the current proportion is up, down or unchanged compared to the base period. The specific way to judge is to compare the relationship between the growth rate of the part and the growth rate of the whole
Partial growth rate" overall growth rate, then the proportion of the current period "the proportion of the base period, that is, the proportion increases;
Part of the growth rate "overall growth rate, then the proportion of the current period" "base period proportion, that is, the proportion decreases;
Partial growth rate = overall growth rate, then the proportion of the current period = the proportion of the base period, that is, the proportion remains unchanged.
Example 1] From January to October 2019, China's import volume of plastic products was 372028 tons, a year-on-year decrease of 64%。Among them, the import volume in October was 38,285 tons, a year-on-year increase of 15%。
Question] In October 2019, did the proportion of China's plastic product imports increase or decrease compared with the same period last year?
Answer] Up. Analysis: As China's plastic product imports increased by 1 year in October 20195%, China's imports of plastic products from January to October 2019 decreased by 6% year-on-year4%, part of the growth rate (15%) is greater than the overall growth rate (-6.).4%), so the share has risen.
02 [Example 2].
In October 2019, the total retail sales of consumer goods increased by 72%, the growth rate fell 0 from the previous month6 percentage points. From January to October, the online retail sales of physical goods in the country still maintained a rapid growth trend, and the online retail sales of physical goods accounted for 19 percent of the total retail sales of consumer goods5%, an increase of 2 year-on-year0 percentage points.
Question] From January to October 2019, the year-on-year growth rate of online retail sales of physical goods in China was faster than that of total retail sales of consumer goods. (True or False).
Answer] Correct. Analysis: According to the materials, from January to October 2019, the proportion of online retail sales of physical goods in the total retail sales of consumer goods increased by 2 year-on-year0 percentage points, that is, the proportion of the increase, can be inferred that part of the growth rate is greater than the overall growth rate, that is, the year-on-year growth rate of online retail sales of physical goods is faster than the total retail sales of consumer goods.
Summary] Through the above example questions, we can see that the test center of "judging the change of proportion" will not only test the direct application, but also test the reverse use, that is, judge the relationship between the partial growth rate and the overall growth rate through the change of the proportion.
03 [Example 3] China's automobile production and sales data for April 2009 released by the China National Automobile Association show that while the sales of automobiles in other countries have further weakened, the domestic passenger car sales have continued to rise, and the sales volume of the month has reached 8310,000 units, an increase of 7 from March59%, a year-on-year increase of 3737%。
Passenger cars are segmented into basic passenger cars (sedans), utility vehicles (MPVs), sport utility vehicles (SUVs), and minivans. Among them, car sales increased by 8 compared with March3%, a year-on-year increase of 3304%;MPV sales were down 3 percent from March54%, down 405%;SUV sales were up 19 percent from March27%, a year-on-year increase of 2255%;Sales of minivans increased by 362%, a year-on-year increase of 7066%。Sedan, MPV, SUV and minivan sales accounted for 21% and 21% of total passenger car sales in April, respectively.
Question] In March 2009, sedan sales accounted for more than 71% of total sales. (True or False).
Answer] False. Analysis: Due to the increase in sedan sales in April 2019 by 83%, and domestic passenger car sales in April 2019 increased by 759%, part of the growth rate (8.3%) is greater than the overall growth rate (7.).59%), i.e., the proportion of car sales in April 2009 was more important than in March 2009, and the share of car sales in March 2009 was less than in April, i.e. 71%.
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