Security industry market is popular in recent years, many websites media security industry market according to the present situation analysis, can make readers through reading these articles in the first time to master the latest data. Recently, there is a paper entitled "to explore the security industry in China: the future or have five times the growth space" in the "average annual compound growth rate" and "daily application of camera" these two concepts, the article through the two aspects of study of Chinese security industry market growth space, we have a few comments. Below we from a different perspective, to explore the method of how to use the scientific study of security market.

A concept, confusing - average annual growth rate with an average annual compound growth rate

Mentioned in this article: "have the article said: 2006-2011 years of Chinese security industry market size by 120 billion yuan rose to 250 billion yuan, the compound annual growth rate of nearly 25%." The basic concept or there is something wrong with the mathematical calculation. We according to the first to calculate the average annual growth rate with an average annual compound growth rate respectively.

1) the average annual growth, often referred to as artificial together to calculate the average growth rate of a few years. Its formula is: data rate = n years (before the current/n - 1-1)/n by 100%, according to data provided by the article, the size of the market in 2006 is 2006 yuan, in 2011 to 250 billion yuan, from 2006 to 2011 n is 5, then the average annual growth rate formula 2500/1200: (1) / 5 x 100% = 21.67%.

2) the average annual compound growth rate of abbreviations for CAGR (CompoundAnnualGrowthRate), it refers to an investment in a particular period of time the average annual compound growth rate. Its formula is: CAGR = (before this period/n - 1 year) ^ {1 / n} by 100%, according to the related data, formula should be 2500/1200 ^ = 15.81% (1/5).

Strictly speaking, the average annual growth rate and average annual compound growth rate are two different concepts, although some people at an average annual growth rate to represent the average annual compound growth rate, but with 15.2% of the year after all growth rate can be doubled in five years, the article "average annual compound growth rate of close to 25%, that is some discrepancy with the real data.

Second, through the camera distribution density data security market both at home and abroad

1) how to evaluate "the density distribution of camera"

This article mentioned the concept of "camera distribution density", the article said: "the China Daily application of camera is about 5, but in Britain and the United States now has more than 80 units, is a more than 50 Taiwan." "Every day people used a camera platform" is a concept of what the paper is not clear. Surveillance cameras sets is average per person per day? Or has cameras sets per person? We calculate a national surveillance cameras distribution density method has a lot of kinds, such as average every one thousand people owned cameras sets, cameras sets, the average per person per day per square kilometer number being filmed, and so on. Because the average per person per day was caught on the number of times it is a difficult work to calculate the statistics, "camera sets per square kilometer" affected by the population density is very big, better indicators occupied per one thousand sets of cameras. And each country's social and economic development level, social security, theoretical calculation of the required average every one thousand people owned cameras sets will also have certain difference.

The author thinks that this article is probably taken an average per person a day. According to the average Chinese in Britain and the United States only 1/13, 5 times as much room for growth is how to calculate? Another question is the "current in the original Chinese people daily application of camera is about 5" key data is how to get?

Below we from "average every one thousand people with cameras sets" of analyze the monitoring of Britain and the United States market.

2) the British - about 75 surveillance cameras per one thousand people

Compared to other countries outside America, the British public surveillance cameras penetration rate is very high. According to incomplete statistics, at present in the working state of the British camera over 4.3 million units, that is to say, the distribution density of the surveillance cameras: about 75 surveillance cameras per one thousand people. According to the video surveillance industry authority, the British security industry association BSIA predicted: "it would be in the next 10 years, the video surveillance industry more than 2 times the growth." By 2013, video monitor market will reach 1.3 billion pounds.

In fact, as early as a few years the British monitoring system has been gradually mature, especially during the 2012 Olympics in London, monitoring and control system is developing rapidly. In 1994 Britain was only 79 city downtown installed video monitoring system; Install the system in 1998, downtown city has amounted to 440. As the 2012 summer Olympics in London, the British government and the ocog increase the security of the games in high position. British departments according to their own need to set up the camera monitoring network, in order to facilitate in security and law enforcement can more timely, more effective to solve the problem.