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China's permanent residents six years of age or above who have residence fixed-line telephones(including home phones, PHS and dormitory telephones) or mobile phones
◇ Sample size
There were 60,000 survey samples in total, including 30,000 for residential fixed-line telephones and the other 30,000 for mobile phones, covering 31 provinces, autonomous regions and municipalities directly under the central government on the Chinese mainland.
◇ Division of survey population
The survey population can be divided into three categories:
Subpopulation A: Survey subpopulation using residence fixed-line telephones (including residents with home phones, PHS users, students with dormitory telephones, and other users with dormitory telephones);
Subpopulation B: Survey subpopulation with mobile phones;
Subpopulation C: Survey subpopulation with both residence fixed-line telephones and mobile phones (there is an overlap between subpopulation A and subpopulation B, and the overlapped part is subpopulation C), C = A∩B.
CNNIC surveys subpopulations A, B and C. Double sampling is adopted for the survey so as to cover as many Internet users as possible. The first sampling frame is subpopulation A, the people with residence fixed-line telephones. The second sampling frame is subpopulation B, the people with mobile phones.
For the survey population with residence fixed-line telephones, stratified two-stage sampling is adopted. To ensure the sufficient representativeness of samples, the whole country is divided into 31 tiers according to the provinces, autonomous regions and municipalities directly under the central government, and the sampling is made independently at each tier.
The self-weighted sampling method is adopted for each provincial-level administrative region. The sample size is allocated for each area, city and prefecture (including the governed districts and counties) in accordance with the proportion of the people at the age of six or above in the city covered by residence fixed-line telephones in the total population covered in the whole region.
Sampling in subpopulation B is similar to that in subpopulation A. The whole country is divided into 31 tiers according to the provinces, autonomous regions and municipalities directly under the central government, and sampling is made independently in each tier. Samples are allocated in accordance with the proportion of the residents in each area or city to make the sample allocation in each provincial-level administrative region conform to the self-weighting method.
To ensure the residence fixed-line telephones are taken with almost the same probability in each area, city or prefecture, which means the local number with more residence fixed-line telephones will more likely be taken; and to make the phone visit more feasible, the residence fixed-line telephone numbers in each area, city and prefecture are taken according to the following procedures:
The survey of the subpopulation with mobile phones is to take all mobile phone local numbers in each area, city and prefecture; then certain 4-digit numbers are generated randomly based on the valid sample size in each area, city or prefecture, and then combined with the mobile phone numbers in each area, city or prefecture to form a number library (local number plus the random 4-digit number); randomly order the number library; dial and visit the randomly ordered number library. Survey of the subpopulation with fixed-line telephones is similar to that of the subpopulation with mobile phones: a random number is generated and combined with the local number to form a telephone number, and then such number is dialed and visited. To avoid repeated sampling, only residence fixed-line telephones are visited.
The computer-assisted telephone interviewing (CATI) system is adopted for the survey.
A study for the subpopulation who are not covered by telephones, conducted by CNNIC in 2005, shows that Internet users are very few in this subpopulation. Currently, the subpopulation is downsizing gradually with the development of our telecom industry. In this survey, there is an assumption—Internet users who are not covered by fixed-line telephones and mobile phones are negligible.
The online survey focuses on the use of typical Internet applications. CNNIC conducted an online survey from December 10 to 31, 2013. The questionnaire was placed on the CNNIC website, and the links were available on China's major websites including government media ones. Internet users voluntarily participated in and filled out the questionnaire. After the questionnaires were returned, questionnaires' validity would be verified and invalid questionnaires were sieved out by special techniques.
Automatic online search is used to conduct technical statistics about quantity of domain names and websites, and their geographical distribution. Statistical data for reporting mainly include the number of IP addresses and international Internet gateway bandwidth.
The data of IP addresses counted by provincial-level administrative region come from the IP address databases of Asia-Pacific Network Information Center (APNIC) and CNNIC. Registered data in each database, which can be distinguished by the region where the addresses belong, can be added respectively by provincial-level administrative region to generate data of each region. As address allocation is a dynamic process, the statistical data are only for reference. In the meanwhile, the Ministry of Industry and Information Technology, as the Chinese department responsible for the administration of IP addresses, will require IP address allocation organizations (such as China Telecom) to report the IP addresses they own biannually. To ensure the accuracy of IP data, CNNIC will compare and verify APNIC statistical data with the reported data to confirm the final quantity of IP addresses.
Total number of domain names and websites in China can be derived from:
The number of domain names: The numbers of .cn and .中国domain names come from the CNNIC database; and the number of generic top-level domains (gTLDs) for China comes from the data released by WebHosting. Info, a domain name statistical agency.
The number of websites: It is worked out by CNNIC according to the lists of domain names. The lists of .cn and .中国domain names come from the CNNIC database, while the list of gTLDs comes from relevant international domain name registries.
China's Ministry of Industry and Information Technology can regularly obtain the number of total gateway bandwidths of Internet connecting Chinese carriers with other countries and regions through a reporting system of telecom enterprises. The reported data are included in the Report .
Internet User or Netizen: China's residents six years of age or above who have used the Internet in the past six months.
Mobile Phone Internet User: Internet users who have used mobile phones to access and surf the Internet in the past six months, but not limited to those surfing the Internet via mobile phones only.
Computer Internet User: Internet users who have used computers to access and surf the Internet in the past six months, but not limited to those surfing the Internet via computers only.
Rural Internet User: Internet users who have mainly lived in China's rural areas in the past six months.
Urban Internet User: Internet users who have mainly lived in China's urban areas in the past six months.
IP Address: As basic resources on the Internet, IP addresses function to identify online computers, servers and other devices connected to the Internet. Connection with the Internet can be realized only when an IP address (in any form) is acquired.
Domain Name: A domain name in this Report only refers to the English domain name, which is a string comprised of numbers, English letters, and hyphens (-) and separated by dots (.). It is a hierarchical structural Internet address identifier corresponding to the IP address. Common domain names are divided into two categories: country code top-level domains (ccTLDs), such as the domain names ended with .cn which represents China; and gTLDs, such as the domain names ended with .com, .net, and .org.
Website: It refers to a website with a domain name itself or www. plus domain name as the web address, including the websites registered under China's .cn and gTLDs. The registrant of the website is within the territory of P. R. China. For example, for the domain name of cnnic.cn, it has only one website and the corresponding web address is cnnic.cn or www.cnnic.cn. Other web addresses with the domain names such as whois.cnnic.cn and mail.cnnic.cn as the suffix are regarded as different channels of the website.
Scope of Survey: Unless otherwise expressly indicated, data in this Report only refer to those for the Chinese mainland, excluding Hong Kong, Macao and Taiwan.
Deadline of Survey Data: The deadline of the statistical survey data is December 31, 2013.