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1、,MAY 31, 2012,Twitter Use 2012,Overall adoption remains steady, but “typical day” usage continues to grow8% of online adults now use Twitter on a typical day. African-Americans, young adults, and mobile users stand out for their high rates of Twitter usage.,Aaron Smith,Senior Research Specialist, Pe
2、w Internet Project Joanna Brenner,Web Coordinator, Pew Internet Project,Pew Research Centers Internet U.S born and non-U.S. born. The White, non-Hispanic subgroup is also balanced on age, education and region. The basic weighting parameters came from a special analysis of the Census Bureaus 2011 Ann
3、ual Social and Economic Supplement (ASEC) that included all households in the United States. The population density parameter was derived from Census 2000 data. The cell phone usage parameter came from an analysis of the July-December 2010 National Health Interview Survey.,Following is the full disp
4、osition of all sampled telephone numbers:,pew internet .org,9,Sample Disposition,Landline,Cell,33,732 1,396 1,483 8 14,936 3,094 12,815 38.0% 1,031 4,290 40 7,454 58.2% 513 5,491 1,450 19.5% 67 - 1,383 95.4% 31 1,352 97.8% 11.1%,22,499 274 47 - 8,237 467 13,474 59.9% 156 5,288 16 8,014 59.5% 1,256 5
5、,273 1,485 18.5% 41 524 920 62.0% 19 901 97.9% 10.8%,Total Numbers Dialed Non-residential Computer/Fax Cell phone Other not working Additional projected not working Working numbers Working Rate No Answer / Busy Voice Mail Other Non-Contact Contacted numbers Contact Rate Callback Refusal Cooperating
6、numbers Cooperation Rate Language Barrier Childs cell phone Eligible numbers Eligibility Rate Break-off Completes Completion Rate Response Rate,The disposition reports all of the sampled telephone numbers ever dialed from the original telephone number samples. The response rate estimates the fractio
7、n of all eligible respondents in the sample that were ultimately interviewed. At PSRAI it is calculated by taking the product of three component rates: Contact rate the proportion of working numbers where a request for interview was made Cooperation rate the proportion of contacted numbers where a c
8、onsent for interview was at least initially obtained, versus those refused Completion rate the proportion of initially cooperating and eligible interviews that were completed Thus the response rate for the landline sample was 11 percent. The response rate for the cellular sample was 11 percent. pew
9、internet .org,Margin,Margin,Margin,on,MOB1,Spring Tracking Survey 2012,Final Topline,04/10/2012,Data for March 15April 3, 2012 Princeton Survey Research Associates International for the Pew Research Centers Internet RANDOMIZE? / IF YES: Did you happen to do this YESTERDAY, or not? Based on those who
10、 use the internet or email on their cell phone or download apps to their cell phone N=953,TOTAL HAVE EVER DONE THIS,- DID YEST ERDAY,HAVE NOT DONE T HIS,DONT KNOW,REFUSED,Use Twitter,Current,16,9,84,*,0,This report is based on the findings of a survey on Americans use of the Internet. The results in
11、 this report are based on data from telephone interviews conducted by Princeton Survey Research Associates International from March 15 to April 3, 2012, among a sample of 2,254 adults, age 18 and older. Telephone interviews were conducted in English and Spanish by landline (1,351) and cell phone (90
12、3, including 410 without a landline phone). For results based on the total sample, one can say with 95% confidence that the error attributable to sampling is plus or minus 2.4 percentage points. For results based Internet users (n=1,803), the margin of sampling error is plus or minus 2.7 percentage
13、points. In addition to sampling error, question wording and practical difficulties in conducting telephone surveys may introduce some error or bias into the findings of opinion polls. A combination of landline and cellular random digit dial (RDD) samples was used to represent all adults in the conti
14、nental United States who have access to either a landline or cellular telephone. Both samples were provided by Survey Sampling International, LLC (SSI) according to PSRAI specifications. Numbers for the landline sample were selected with probabilities in proportion to their share of listed telephone
15、 households from active blocks (area code + exchange + two-digit block number) that contained three or more residential directory listings. The cellular sample was not list-assisted, but was drawn through a systematic sampling from dedicated wireless 100-blocks and shared service 100-blocks with no
16、directory-listed landline numbers. New sample was released daily and was kept in the field for at least five days. The sample was released in replicates, which are representative subsamples of the larger population. This ensures that complete call procedures were followed for the entire sample. At l
17、east 7 attempts were made to complete an,pew internet .org,10,interview at a sampled telephone number. The calls were staggered over times of day and days of the week to maximize the chances of making contact with a potential respondent. Each number received at least one daytime call in an attempt t
18、o find someone available. For the landline sample, interviewers asked to speak with the youngest adult male or female currently at home based on a random rotation. If no male/female was available, interviewers asked to speak with the youngest adult of the other gender. For the cellular sample, inter
19、views were conducted with the person who answered the phone. Interviewers verified that the person was an adult and in a safe place before administering the survey. Cellular sample respondents were offered a post-paid cash incentive for their participation. All interviews completed on any given day
20、were considered to be the final sample for that day. Weighting is generally used in survey analysis to compensate for sample designs and patterns of non- response that might bias results. A two-stage weighting procedure was used to weight this dual-frame sample. The first-stage corrected for differe
21、nt probabilities of selection associated with the number of adults in each household and each respondents telephone usage patterns. This weighting also adjusts for the overlapping landline and cell sample frames and the relative sizes of each frame and each sample. The second stage of weighting bala
22、nces sample demographics to population parameters. The sample is balanced to match national population parameters for sex, age, education, race, Hispanic origin, region (U.S. Census definitions), population density, and telephone usage. The Hispanic origin was split out based on nativity; U.S born a
23、nd non-U.S. born. The White, non-Hispanic subgroup is also balanced on age, education and region. The basic weighting parameters came from a special analysis of the Census Bureaus 2011 Annual Social and Economic Supplement (ASEC) that included all households in the United States. The population dens
24、ity parameter was derived from Census 2000 data. The cell phone usage parameter came from an analysis of the July-December 2010 National Health Interview Survey Following is the full disposition of all sampled telephone numbers:,pew internet .org,11,Table 2:Sample Disposition,Landline 33,738,Cell 22
25、,143 Total Numbers Dialed,1,502 1,491 8 15,401 2,746 12,590 37.3% 915 3,472 66 8,137 64.6% 523 6,161 1,453 17.9% 52 - 1,401 96.4% 50 1,351 96.4% 11.1%,332 45 - 8,237 404 13,126 59.3% 135 4,465 5 8,521 64.9% 1,382 5,654 1,485 17.4% 43 498 944 63.6% 41 903 95.7% 10.8%,Non-residential Computer/Fax Cell
26、 phone Other not working Additional projected not working Working numbers Working Rate No Answer / Busy Voice Mail Other Non-Contact Contacted numbers Contact Rate Callback Refusal Cooperating numbers Cooperation Rate Language Barrier Childs cell phone Eligible numbers Eligibility Rate Break-off Com
27、pletes Completion Rate Response Rate,The disposition reports all of the sampled telephone numbers ever dialed from the original telephone number samples. The response rate estimates the fraction of all eligible respondents in the sample that were ultimately interviewed. At PSRAI it is calculated by
28、taking the product of three component rates: Contact rate the proportion of working numbers where a request for interview was made Cooperation rate the proportion of contacted numbers where a consent for interview was at least initially obtained, versus those refused Completion rate the proportion of initially cooperating and eligible interviews that were completed Thus the response rate for the landline sample was 11 percent. The response rate for the cellular sample was 11 percent.,pew internet .org,12,