• Title/Summary/Keyword: telephone survey

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Unit Nonrespondents in a Taiwan Telephone Survey

  • Chen, Kuang-hui
    • Asian Journal for Public Opinion Research
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    • v.3 no.3
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    • pp.111-130
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    • 2016
  • Researchers have been perplexed by the issue of unit nonresponse since the beginning of practicing survey research and have been attentive to the causes that lead to the occurrence of unit nonresponse as well as the impact of unit nonresponse. However, because researchers have little to no information regarding unit nonrespondents, it is unlikely that they are able to examine the differences between participants and nonrespondents to estimate the loss of representativeness in the final sample compared with the target population. Therefore, the lack of information regarding the absentees complicates addressing the unit nonresponse bias in a satisfactory manner. Therefore, the purpose of this study was to determine the demographic characteristics and political attitudes of nonrespondents by relying on information provided by their spouses, which was obtained through a telephone survey conducted in Taiwan. It is found that demographic variables as well as political attitudes are related to the likelihood of an individual becoming a unit nonrespondent in telephone surveys.

An Exploration on Random Sampling Telephone Survey -The Case of the Ulsan Mayoral Election in 2002- (임의표집법에 의거한 전화조사의 시도 -2002년 울산시장선거의 경우-)

  • No, Kyu-Hyung;Khang, Hung-Soo;Han, Cheol-Soo
    • Survey Research
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    • v.3 no.2
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    • pp.77-90
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    • 2002
  • This study reports the results of a random sampling telephone survey conducted in the case of the Ulsan mayoral election 2002. We interview at least five times to a respondent who is randomly selected by means of the birthday method from a randomly sampled telephone number list of 1,233 households, We analyze the result of interviewing, such as absence and promise. And we compare the demographic variables of the surveyed sample and those of the population and we also compare the randomly selected sample's voting preference with outcome of the election in various ways. Finally, we discuss difficulty of random sampling with the birthday method and suggest some technical tips to conduct random sampling telephone survey.

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Estimation of Transition Probability on Two Successive Occasions Sampling with Randomized Response Technique

  • Lee, Kay-O
    • Communications for Statistical Applications and Methods
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    • v.6 no.3
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    • pp.761-770
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    • 1999
  • A combination procedure of successive occasions sampling and randomized response method is investigated. Randomized response technique is very simple for use in a telephone survey of a sensitive subject. In the suggested randomized response method. the interviewee replies "yes" or "no" to a randomly selected question and the investigator can estimate the proportion of "yes" or "no" answer. When this procedure is used on successive occasions, not only the proportion supporting a candidate and the time change in this supporting proportion can be derived but also the voters' swing in the trend of voters' support can be estimated. A numerical example is given to show how the suggested sampling strategy can be applied to a practical telephone survey.

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The Use of Ojeok-san in Low Back Pain Patients : Results of a Telephone Survey (요통진료 및 오적산 사용현황파악을 위한 전화설문조사)

  • Shin, Kyung-Min;Jang, Min-Gee;Kim, Eun-Jung;Kim, Sun-Woong;Lee, Jae-Dong;Kim, Kap-Sung;Lee, Seung-Deok
    • Journal of Acupuncture Research
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    • v.27 no.2
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    • pp.71-78
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    • 2010
  • Objectives : This survey was accomplished to find out how Korean medical doctors take Ojeok-san prescriptions for low back pain in clinical practice. Methods : The survey questionnaire was developed by the committee of experts who major in acupuncture & moxibustion or statistics for acupuncture clinical trial protocol development. 306 persons having more than 5 years experience were randomly selected from a list of Korean medical doctors. Telephone interviews with them were conducted by the well-trained interviewers between March 21 and April 4 in 2009 and the computerized data were analyzed by STATA 9.0 SE version(Stata Corp, Colleg Station Tex, USA) statistical program. Results : 1. 192 out of 306(65.1%) Korean medical doctors taked Ojeok-san prescriptions for musculoskeletal disorders patients and 183 out of 192(95.3%) Korean medical doctors taked Ojeok-san prescriptions for low back pain treatment. 2. The rate of low back pain patients, '20~30%' was 99 people(33.6%) and the rate of Ojeok-san prescriptions for low back pain treatment, 'below 10%' was 65 people(35.5%). 3. In Ojeok-san effect of low back pain treatment, 'greate effects' 29.5%, 'tolerable effects' 66.7%, 'no effects' 3.8% were selected. In granule extracts effect, 'similar to Original herbs' 9.8%, 'unlike to Original herbs' 90.2% were selected. Conclusions : In our telephone survey, Korean medical doctors taked Ojeok-san prescriptions for low back pain treatment. Further research on this issue is needed.

Random Digit Dialing Telephone Survey and Major Findings (RDD 전화조사와 주요결과)

  • Kang, H.C.;Han, S.T.;Kim, J.Y.;Jung, Y.C.;Huh, M.H.
    • Survey Research
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    • v.9 no.1
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    • pp.1-22
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    • 2008
  • Telephone directories ille still being used as the sampling frame in almost all fixed-line telephone surveys in Korea, causing potentially serious coverage error. RDD (random digit dialing) sampling is an obvious alternative to solve the problem. The aim of this paper is twofold: 1) proposal of RDD methodology suitable to the telephone system of Korea and 2) the identification of socio-demographic and socio-psychological differences between listed-number and unlisted-number respondents. Major findings of RDD telephone survey conducted experimental]y are as follows. 1) Population coverage by telephone directories is 60% or less. 2) Unlisted-number households have statistically larger income compared to listed-number households. 3) Unlisted-number households have smaller family size compared to listed-number households. 4) Unlisted-number respondents are more sensitive about confidentiality, leaks, 5) Unlisted-number respondents are more liberal compared to unlisted-number respondents. These facts suggest that directory-based telephone surveys tend to be biased in socio-economic aspects.

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Application of Random Sampling Procedures in a Telephone Survey (전화조사 상황에서 무선표집절차의 적용결과: 단계별 응답특성을 중심으로)

  • Cho, Sung-Kyum;Cho, Eun-Hee
    • Survey Research
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    • v.11 no.2
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    • pp.141-160
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    • 2010
  • This study aims to analyze the usefulness of the survey procedures developed for telephone surveys using a random sampling method. We conducted a telephone survey of residents in a local area from October 26 to November18,2009. We applied random sampling procedures with five call-backs. Particular attention was given to the conversion of refusals. Out of 2,454 phone numbers, we succeeded in getting responses from 637 numbers. The absence of residents was the primary cause of non-response. We received responses from 45.7% of those with whom we successfully made contact. One finding of this study is that, contrary to our initial expectations, call-backs do not significantly increase the percentage of responses from young people. Also we cannot find any significant differences in responses to various questions between the responses received from the first round of calls and later responses. However, these results are not conclusive; another survey may produce different results. Therefore, further research is needed.

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Bias caused by nonresponses and suggestion for increasing response rate in the telephone survey on election (전화 선거여론조사에서 무응답률 증가로 인한 편의와 응답률 제고 방안)

  • Heo, Sunyeong;Yi, Sucheol
    • Journal of the Korean Data and Information Science Society
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    • v.27 no.2
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    • pp.315-325
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    • 2016
  • Thanks to the advantages of low cost and quick results, public opinion polls on election in Korea have been generally conducted by telephone survey, even though it has critical disadvantage of low response rate. In public opinion polls on election in Korea, the general method to handle nonresponses is adjusting the survey weight to estimate parameters. This study first drives mathematical expression of estimator and its bias with variance estimators with/without nonresponses in election polls in Korea. We also investigates the nonresponse rate of telephone survey on 2012 Korea presidential election. The average response rate was barely about 14.4%. In addition, we conducted a survey in April 2014 on the respondents's attitude toward telephone surveys. In the survey, the first reason for which respondents do not answer on public opinion polls on election was "feel bothered". And the aged 20s group, the most low response group, also gave the same answer. We here suggest that survey researchers motivate survey respondents, specially younger group, to participate surveys and find methods boosting response rate such as giving incentive.

A Study on Weighting Cells by Survey Methods for Social Surveys: Telephone, Internet and Mobile Surveys (사회조사에서 조사방법에 따른 가중 칸 설정에 관한 연구: 전화조사, 인터넷 조사, 모바일 조사)

  • 허명회;강용수;손은진
    • Survey Research
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    • v.5 no.1
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    • pp.1-26
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    • 2004
  • The aim of this study lies in answering the question "How to form weighting cells to enhance sample representativeness in telephone, Internet and mobile surveys\ulcorner". For this, we explored 2% raw data of Year 2000 Population and Housing Census of Korea looking for meaningful patterns for ownership of telephones, the usage of Internet and/or mobile phones. We found that telephone coverage rates vary significantly by household size; 84.6% for one member households, contrasting 98.5% for two-or-more member households. Thus, telephone survey samples need to be weighted differently in sub-groups by household size for proportional representation of target population. Searching socio-demographic factors influencing the use of Internet by C5.0 tree models, we found that education levels and the occupation (or housing type, the automobile ownership) are two most important factors in addition to gender and age. Thus, surveyor might form weighting cells by such factors at the stage of post-stratification or set quotas, a priori, proportional to size of the cells by such factors. For mobile surveys, we approached similarly and found that education levels and the occupation (or the automobile ownership, marriage status) are two additional factors that may be used in forming weighing cells or in setting quotas for cells.

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Time-Balanced Quota Sampling for Telephone Survey (전화조사를 위한 시간균형할당표본추출)

  • Huh, Myung-Hoe;Hwang, Jin-Mo
    • Survey Research
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    • v.7 no.2
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    • pp.39-52
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    • 2006
  • Most of Korean survey institutions adopt quota sampling for telephone surveys based on region, gender and age-band. In weekdays, it is well blown that there exist substantial differences in day time in-house rate by individual's socio-demographic attributes. So, quota sampling may induce systematic respondent selection bias. To solve the problem, we propose "time-balanced quota sampling" in which interviewer's call time-band is added as an quota variable. Furthermore, we propose "time-balanced quasi-quota sampling" which is derived by partially relaxing evening time quotas in time-balanced quota sampling. We compare the conventional and the newly proposed quota sampling schemes by drawing Monte Carlo samples from the hypothetical population for which the Korea 2004 time use survey data is assumed.

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The Major Findings of the Telephone Survey by Random Digit Dialing and Time-Balanced Quota Sampling (임의번호걸기와 시간균형할당표집에 의한 전화조사의 주요결과)

  • Huh, M.H.;Han, S.T.;Kim, J.Y.;Sung, E.H.;Kang, H.
    • Survey Research
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    • v.12 no.2
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    • pp.77-88
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    • 2011
  • Korean telephone surveys have been based on telephone directory and thus criticized for considerable under-coverage. Now, Korean survey institutions progress to random digit dialing (RDD) very actively. But still most surveys are administered by quota sampling, prone to assign heavier weights to social classes with more hours staying indoor. As a practical remedy, time-balanced quota sampling scheme was proposed by Huh and Hwang (2006). This study compares two telephone surveys on TV audience environment in Korea: RDD with conventional quota sampling versus RDD with time-balanced quota sampling.

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