• 제목/요약/키워드: Population survey

검색결과 2,854건 처리시간 0.03초

사업체조사에서의 무응답 편향보정 추정에 관한 연구 (A study on non-response bias adjusted estimation in business survey)

  • 정희영;신기일
    • 응용통계연구
    • /
    • 제33권1호
    • /
    • pp.11-23
    • /
    • 2020
  • 표본조사는 비용과 시간을 절약하면서도 주어진 정확성을 만족하는 통계를 얻을 수 있다. 그러나 최근에는 다수의 무응답 발생으로 인해 조사의 정확성이 크게 떨어지고 있다. 무응답은 다양한 이유로 발생하고 있으나 무응답이 관심변수와 함수 관계가 있는 경우에는 이 정보를 이용하여 무응답을 적절히 처리해야 추정의 정확성이 유지될 수 있다. 최근 Chung과 Shin (2017, 2019), Min과 Shin (2018)은 응답률이 관심변수의 지수 또는 선형함수이고 초모집단모형의 오차가 정규분포를 따를 때 무응답으로 인해 발생한 편향을 제거함으로써 추정의 정확성이 향상되는 것을 확인하였다. 이에 본 연구에서는 사업체조사에서 초모집단모형의 오차가 감마분포 또는 로그-정규분포를 따르는 경우에서의 무응답 편향보정 추정량을 제안하였다. 또한 모의실험을 통하여 제안된 추정량의 우수성을 확인하였다.

The Determinats of Infant and Child Mortality in Korea: 1955-1973

  • Kim, Tai-Hun
    • 한국인구학
    • /
    • 제9권2호
    • /
    • pp.93-105
    • /
    • 1986
  • 우리나라에서의 호구통계작성제도는 오래전부터 운영되고 있었다. 현존하는 기록으로는 통일 신라시대의 촌적제도, 고려, 조선시대의 호구성적 등으로부터의 자료에서 찾아볼 수 있다. 당시 이러한 호구성적제도는 순수한 통계작성목적보다는 징병, 요역, 세금부과, 신분유지 등의 목적으로 이루어지게 된것이다. 이러한 호구성적제도로부터 작성된 호구통계는 완전성 및 정확성의 측면에서 다소 호구의 누락등 오차가 있는것으로 추정된다. 따라서 정확한 호구통계파악을 위하여 1896.9.1자로 호구조사 규칙이 제정되었고, 1909년에는 민적법이, 1925년에는 인구센서스가 도입되어 호구통계를 작성할수 있는 제도가 세분되었다. 오늘날 통계의날 기념일을 매년 9월1일로 정한것도 이와같은 근거 때문이다. 이와 같은 제도는 1960년대 초 호적법, 주민등록법의 전면적인 개정으로 정도 높은 호구 통계를 작성하는데까지 이어졌다.

  • PDF

합천호의 어류상 변화와 블루길(Lepomis macrochirus) 개체군의 특성 (Changes in Icthyofauna of Hapcheon Lake and Characteristics of the Bluegill, Lepomis macrochirus Population)

  • 장창열;배양섭
    • 한국환경생태학회지
    • /
    • 제34권6호
    • /
    • pp.543-550
    • /
    • 2020
  • 본 연구는 합천댐 및 주변하천에서 서식하는 어류상과 외래도입종인 블루길 개체군에 대한 특성을 파악하고 기초 자료를 제공하고자 시행된 연구이다. 합천댐 및 주변지류에 서식하는 어류를 대상으로 2016년부터 2017년까지 조사를 수행한 결과, 확인된 어류상은 총 10과 30종 1,785개체이었으며, 한국고유종은 8종(고유화율 21.8%), 외래도입종 3종, 생태계교란 생물 2종이 조사되었다. 본 연구와 과거조사를 비교한 결과, 과거조사에서 12과 36종이 보고되었고, 과거조사시 확인되었으나 본 연구에서 조사되지 않은 종은 총 14종으로, 합천호에 대해 세밀한 조사를 시행할 경우 대부분 확인될 것으로 판단된다. 합천호에 우점종으로 확인된 블루길 개체군에 대해 전장-체중 관계식을 분석한 결과, 연령구조는 1~2년생의 개체군이 많이 확인되어 개체군이 급격히 성장하는 단계인 것으로 나타났다. 비만도와 전장-체중 관계식은 모두 양호한 상태로 확인되어 블루길 개체군에 대한 관리방안이 마련되어야 할 것으로 판단된다. 본 연구결과를 사용하여 합천댐 및 주변하천에 서식하는 블루길 개체군에 대한 성장 및 동향을 파악하는데 유용한 자료로 활용될 것으로 보여진다.

An Overview of Bootstrapping Method Applicable to Survey Researches in Rehabilitation Science

  • Choi, Bong-sam
    • 한국전문물리치료학회지
    • /
    • 제23권2호
    • /
    • pp.93-99
    • /
    • 2016
  • Background: Parametric statistical procedures are typically conducted under the condition in which a sample distribution is statistically identical with its population. In reality, investigators use inferential statistics to estimate parameters based on the sample drawn because population distributions are unknown. The uncertainty of limited data from the sample such as lack of sample size may be a challenge in most rehabilitation studies. Objects: The purpose of this study is to review the bootstrapping method to overcome shortcomings of limited sample size in rehabilitation studies. Methods: Articles were reviewed. Results: Bootstrapping method is a statistical procedure that permits the iterative re-sampling with replacement from a sample when the population distribution is unknown. This statistical procedure is to enhance the representativeness of the population being studied and to determine estimates of the parameters when sample size are too limited to generalize the study outcome to target population. The bootstrapping method would overcome limitations such as type II error resulting from small sample sizes. An application on a typical data of a study represented how to deal with challenges of estimating a parameter from small sample size and enhance the uncertainty with optimal confidence intervals and levels. Conclusion: Bootstrapping method may be an effective statistical procedure reducing the standard error of population parameters under the condition requiring both acceptable confidence intervals and confidence level (i.e., p=.05).

성인의 비만과 치주질환의 관련성 (Relationship between obesity and periodontal diseases in adults)

  • 김수경
    • 한국치위생학회지
    • /
    • 제16권6호
    • /
    • pp.815-824
    • /
    • 2016
  • Objectives: The purpose of the study is to investigate the relationship between obesity and periodontal diseases in adults. Methods: The subjects were 6,762 adults over 19 years old selected from the 6th Korean National Health and Nutrition Examination Survey (2013). The study instruments included periodontal status of periodontal diseases, body mass index (BMI), and waist circumference (WC). Periodontal status was evaluated by community periodontal index (CPI). Data were analyzed using SPSS 18.0 program. Results: The prevalence of periodontal diseases was higher in male, older aged people, undereducated people, current smokers, and those having poor cognition for toothbrushing (p<0.001). The rate of obesity by BMI and WC was higher in male, older aged people and current smokers. The rate of obesity was lower in well-educated people and good practice of toothbrushing (p<0.001). The prevalence of periodontal diseases by BMI showed 0.565 times lower in underweight population, 1.302 times higher in overweight population, and 1.311 times higher in highly obese population than normal population. The prevalence of periodontal diseases by waist circumferences showed 1.404 times higher in obese population than the normal population (p<0.05). Conclusions: It is very important to promote periodontal disease prevention and education for obese population in Korea. The risk of periodontal diseases can be preventable by decrease of BMI and WC.

은줄팔랑나비 개체군의 서식지 내 분포특성 (Distribution Characteristics in the Habitat of Leptalina unicolor Population)

  • 홍성진;윤춘식;정선우
    • 한국환경과학회지
    • /
    • 제28권12호
    • /
    • pp.1123-1131
    • /
    • 2019
  • In this study, we investigated the spatial range, distribution pattern, temporal appearance, sex ratio, seasonal pattern, and size of the population of Leptalina unicolor locally inhabiting the wetland protection area in the Jaeyaksan Mountain. We found that the butterfly was distributed across four areas at 750 m above sea level and in an area of 96,000 ㎡. in the southeastern slope of the mountain. The discontinuous distribution of the butterflies in the meadow. According to our survey conducted from 2012 to 2014, L. unicolor occurred in May (spring) and July (summer) each year, with the male population more than three times higher than that of the female population. The population size estimated using the mark and recapture method on the back of the hind wing in the two years was as follows: 877±502 and 1243±800 individuals in the spring and summer of 2012, respectively, and 783±429 and 506±365 individuals in the spring and summer of 2014, respectively, suggesting no specific seasonal pattern. The findings of this study are expected to be useful for the conservation of the populations and habitats of L. unicolor, which are currently distributed locally due to a decrease in population size.

Chi-squared Tests for Homogeneity based on Complex Sample Survey Data Subject to Misclassification Error

  • Heo, Sunyeong
    • Communications for Statistical Applications and Methods
    • /
    • 제9권3호
    • /
    • pp.853-864
    • /
    • 2002
  • In the analysis of categorical data subject to misclassification errors, the observed cell proportions are adjusted by a misclassification probabilities and estimates of variances are adjusted accordingly. In this case, it is important to determine the extent to which misclassification probabilities are homogeneous within a population. This paper considers methods to evaluate the power of chi-squared tests for homogeneity with complex survey data subject to misclassification errors. Two cases are considered: adjustment with homogeneous misclassification probabilities; adjustment with heterogeneous misclassification probabilities. To estimate misclassification probabilities, logistic regression method is considered.

Statistical Survey about the Rates of Application for the 2005 Susi Second Semester Admission to Universities in Daegu and Kyungbook

  • Kim, Jong-Tae
    • Journal of the Korean Data and Information Science Society
    • /
    • 제15권4호
    • /
    • pp.845-853
    • /
    • 2004
  • This study is to adjust the focus on the statistical survey about the rates of application for the 2005 Susi second semester admission to Universities in Daegu, Kyungbook. The decrease of population for university admission and the change of paradigm of selecting a field of specialization in university will have an adverse effect on ratios of admission. This is very important to the future of university in Daegu, Kyungbook.

  • PDF

A Nationwide Survey on the Prevalence of Intestinal Parasitic Infections in the Republic of Korea, 2004

  • Kim, Tong-Soo;Cho, Shin-Hyeong;Huh, Sun;Kong, Yoon;Sohn, Woon-Mok;Hwang, Seung-Sik;Chai, Jong-Yil;Lee, Soon-Hyung;Park, Yun-Kyu;Oh, Dae-Kyu;Lee, Jong-Koo;Working Groups in National Institute of Health, Working Groups in National Institute of Health;Korea Association of Health Promotion, Korea Association of Health Promotion
    • Parasites, Hosts and Diseases
    • /
    • 제47권1호
    • /
    • pp.37-47
    • /
    • 2009
  • National surveys on the prevalence of intestinal parasitic infections have been carried out every 5-7 years since 1971 in the Republic of Korea in order to establish control measures. The present nationwide survey was conducted from June to December 2004. The 10% population sampling data of Population and Housing Census by the Korean government in 2000 was used as the survey population. One sample was selected randomly from each of the 22,858 registered subjects, and a total of 20,541 people were ultimately included in this survey. Fecal examinations were performed by the cellophane thick smear and saturated brine flotation techniques. Pinworm infection was examined by cello-tape anal swab method. This survey also included a questionnaire study for a socioeconomic analysis. The total helminth egg positive rate was 3.7%, and the estimated total positive number among nationwide people was 1,780,000. The rates in urban and rural areas were 3.1% and 6.8%, respectively. As the total egg positive rate in the 6th survey in 1997 was 2.4%, the present survey showed that there was a considerable degree of increase in the prevalence rate of intestinal parasitic infections over the 7-year period following the 6th survey. The largest increases occurred in the egg positive rates of Clonorchis sinensis and heterophyids including Metagonimus yokogawai.

통계청 가구부문 조사의 표본설계 (Redesigning KNSO s Household Survey Sample)

  • 윤연옥;김규영;이명호
    • 한국조사연구학회지:조사연구
    • /
    • 제5권1호
    • /
    • pp.103-130
    • /
    • 2004
  • 통계청에서 매월 실시하는 주요 가구부문 경상조사에는 경제활동인구조사와 가계조사가 있다. 이 두 조사의 표본은 인구주택총조사 자료를 표본틀로 하여 5년마다 개편되고 있다. 이 논문에서는 2000년 인구주택총조사를 바탕으로 2002년에 실행한 표본개편에 관한 내용을 수록하였다. 이번 표본개편의 주요 개선사항으로는 연동표본(Rotation Sampling)의 도입, 도시가계조사를 전국가계조사로의 확대, 고용통계의 소지역통계 생산을 위한 기반마련이다. 또한 조사구 내의 표본가구수를 24가구에서 20가구로 축소하고, 표본 조사구수를 증가시킴으로써 정도 높은 자료를 생산할 수 있는 기반을 마련하였다. 대표성 있는 표본조사구 추출을 위한 분류지표 선정 과정에서는 지역별로 대표성이 높은 분류지표를 선정하여 대표성 있는 표본을 추출하는 데 기여하였다.

  • PDF