• 제목/요약/키워드: latent class cluster analysis

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잠재계층분석에 따른 수단선택모형비교분석 (Latent Class Analysis for Mode Choice Behavior)

  • 배윤경;정진혁;김형진
    • 대한교통학회지
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    • 제28권3호
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    • pp.99-107
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    • 2010
  • 교통수요예측 과정 중 수단선택과정은 적용시 매우 복잡하여, 선택자의 특성을 이해하기도 매우 까다로운 과정이다. 일반적으로 수단 선택시 선택자의 사회경제적인 요소 외에도 심리적인 요인이나 특성들도 중요한 영향을 미치는 것으로 알려져 있다. 따라서, 심리적인 요인이나 특정한 선호도를 선택모형 상에서 적용할 수 있는 방법론에 대한 활발한 연구가 진행되고 있으며, 이러한 연구 중에서 잠재계층분석(Latent Class Analysis)는 이론적으로 매우 가능성이 있는 접근 방법으로 인식되고 있다. 본 연구에서는 심리적인 요인과 특성들이 수단선택에 미치는 영향을 분석하기 위하여 잠재계층분석(latent class cluster analysis)을 실시하여 계층을 분리하였다. 또한, 계층별로 나타나는 수단선택모형과 잠재 계층을 고려하지 않은 수단선택모형을 비교하여 잠재계층의 수단 선택 행태가 각기 다름을 보이고자 한다. 본 연구는 한강 수상교통 도입에 대한 일반 시민의 선호도 조사와 SP자료를 바탕으로 분석되었으며, 잠재계층분석은 잠재 선호를 고려할 수 있는 가능성 높은 접근임을 보였다.

Evaluation of consumer preferences for general food values in Korea: best-worst scaling approach

  • Chang, Jae Bong
    • 농업과학연구
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    • 제45권3호
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    • pp.547-559
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    • 2018
  • Consumers are becoming increasingly interested in what kind of value their food has. Many studies have focused on consumers' preferences and willingness to pay for specific food values. However, few studies have asked consumers to consider or rank the importance of different food values. This paper determined consumers' food values by implementing the best-worst scaling approach and segmented consumers based on the relative importance of general food values that consumers place on them. Among a list of eleven food values (taste, safety, origin, appearance, price, environmental impact, naturalness, convenience, nutrition, fairness, and habit) which was compiled from previous studies on food preferences, on average, safety, nutrition, taste, and price were the most important values to consumers, whereas fairness, habit, appearance, convenience, origin, and environmental impact were the least important values. However, significant variation exists among consumers in terms of the relative importance of food values. To investigate the heterogeneity among consumers, a Latent Class Analysis was performed to classify consumers into subgroups based on responses to questions. Two latent classes were found and characterized as 'safety-nutrition' and 'taste-price'. The 'safety-nutrition' cluster represents 61% of the sample and a group of people who find safety and nutrition centered values to be the most important. Another cluster represents about 39% of the sample, and relative to the first group, this group finds price and taste values to be more important.

건설사고 분석을 위한 텍스트 마이닝 기반 데이터 전처리 및 사고유형 분석 (Text mining-based Data Preprocessing and Accident Type Analysis for Construction Accident Analysis)

  • 윤영근;이재윤;오태근
    • 한국안전학회지
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    • 제37권2호
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    • pp.18-27
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    • 2022
  • Construction accidents are difficult to prevent because several different types of activities occur simultaneously. The current method of accident analysis only indicates the number of occurrences for one or two variables and accidents have not reduced as a result of safety measures that focus solely on individual variables. Even if accident data is analyzed to establish appropriate safety measures, it is difficult to derive significant results due to a large number of data variables, elements, and qualitative records. In this study, in order to simplify the analysis and approach this complex problem logically, data preprocessing techniques, such as latent class cluster analysis (LCCA) and predictor importance were used to discover the most influential variables. Finally, the correlation was analyzed using an alluvial flow diagram consisting of seven variables and fourteen elements based on accident data. The alluvial diagram analysis using reduced variables and elements enabled the identification of accident trends into four categories. The findings of this study demonstrate that complex and diverse construction accident data can yield relevant analysis results, assisting in the prevention of accidents.

만성질환에 관한 잠재계층분석과 예측요인 -2014 국민건강영양조사를 중심으로- (A Latent Class Analysis and Predictors of Chronic Diseases -Based on 2014 Korea National Health and Nutrition Examination Survey-)

  • 김우진;이송이
    • 한국산학기술학회논문지
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    • 제19권6호
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    • pp.324-333
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    • 2018
  • 본 연구의 목적은 만성질환인 고혈압, 이상지질혈증, 관절염, 갑상선 질환, 우울증, 아토피, 알레르기, 당뇨병 등의 잠재계층이 어떻게 구성되어 있는지와 유형화된 만성질환의 예측요인을 살펴보고자 하는 것이다. 연구대상은 2014년 국민건강영양조사에 참여한 대한민국 국민으로, 표본추출방법은 층화집락표본추출방법을 사용하였으며 표본 수는 총 7,550명이고, 이를 대상으로 잠재계층분석을 적용하였다. 결과적으로 1 class 유형은 고혈압, 당뇨 그룹으로 고혈압을 앓고 있을 확률이 78.6%이고 당뇨병을 앓고 있을 확률이 34.6%이었다. 2 class 유형은 아토피, 알레르기 그룹으로 아토피를 앓고 있을 확률이 20.3%이고 알레르기를 앓고 있을 확률이 42.2%이었다. 3 class 유형은 이상지질, 관절염, 갑상선질환, 우울증 그룹으로 이상지질 56.1%, 관절염 50.9%, 갑상선 질환 19.4%, 우울증 28.75%로 나타날 확률을 지닌 집단이었다. 4 class 유형은 만성질환을 갖고 있지 않은 정상집단으로 나타났다. 준거변수인 4 class와 1 class를 비교하였을 때, 연령, 운동능력, 자기관리, 비만, 고콜레스테롤 유병여부 등이 유의하게 나타났고, 2 class와 비교하였을 때, 성별, 연령, 교육수준 등이 유의하게 나타났으며, 3 class와 비교하였을 때, 성별, 연령, 통증 및 불편, 고 콜레스테롤 등이 유의하게 나타났다. 결과적으로 세 유형 모두 연령은 복합적인 만성질환을 일으킬 수 있는 요인으로 나타났는데, 이는 질환을 일으킬 수 있는 결정적인 시기가 오기 전에 예방이 중요하다는 것을 의미한다. 따라서 연령에 따른 질병의 유병율 발생 시기를 파악하여 이에 적절한 예방적 노력이 필요하다.

전기차 이용자의 일단위 및 주단위 충전 프로파일 유형화 분석 : 순차패턴분석과 잠재계층분석을 중심으로 (Identifying Daily and Weekly Charging Profiles of Electric Vehicle Users in Korea : An Application of Sequence Analysis and Latent Class Cluster Analysis)

  • 이재현;윤서연
    • 한국ITS학회 논문지
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    • 제21권6호
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    • pp.194-210
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    • 2022
  • 최근 정부가 지향하고 있는 이용자 중심의 충전인프라 구축방향은 실제 전기차 이용자들의 편의를 높이며, 새로운 전기차 이용자를 시장으로 유입할 수 있는 중요한 정책이다. 본 연구는 이러한 정책의 수립에 기초자료로 활용될 수 있는 실제 전기차 이용자들의 충전행태에 대한 깊이 있는 이해를 제공하는 것을 목적으로 수행되었다. 일주일 동안 수집된 충전일지 자료에 기반하여 전기차 이용자들의 충전행태를 일단위 및 주단위로 분석하였으며, 순차패턴 분석과 잠재계층 분석을 활용하였다. 그 결과, 5가지 일단위 충전 프로파일과 4가지 주단위 충전 프로파일을 도출하였으며, 이는 향후 이용자 중심 충전인프라 정책 수립뿐만 아니라 잠재 전기차 이용자들의 의사결정에 핵심적인 정보를 제공하여 전기차 시장을 활성화하는데도 기여할 것으로 판단된다.

Patterns of Cancer-Related Risk Behaviors Among Construction Workers in Hong Kong: A Latent Class Analysis Approach

  • Xia, Nan;Lam, Wendy;Tin, Pamela;Yoon, Sungwon;Zhang, Na;Zhang, Weiwei;Ma, Ke;Fielding, Richard
    • Safety and Health at Work
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    • 제11권1호
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    • pp.26-32
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    • 2020
  • Background: Hong Kong's construction industry currently faces a manpower crisis. Blue-collar workers are a disadvantaged group and suffer higher levels of chronic diseases, for example, cancer, than the wider population. Cancer risk factors are likely to cluster together. We documented prevalence of cancer-associated lifestyle risk behaviors and their correlates among Hong Kong construction workers. Methods: Data were collected from workers at 37 railway-related construction worksites throughout Hong Kong during May 2014. Tobacco use, alcohol consumption, unbalanced nutrition intake, and physical inactivity were included in the analysis. Latent class analysis and multivariable logistic regression were performed to identify the patterns of risk behaviors related to cancer, as well as their impact factors among construction workers in Hong Kong. Results: Overall, 1,443 workers participated. Latent class analysis identified four different behavioral classes in the sample. Fully adjusted multiple logistic regression identified age, gender, years of Hong Kong residency, ethnicity, educational level, and living status differentiated behavioral classes. Conclusion: High levels of lifestyle-related cancer-risk behaviors were found in most of the Hong Kong construction workers studied. The present study contributes to understanding how cancer-related lifestyle risk behaviors cluster among construction workers and relative impact factors of risk behaviors. It is essential to tailor health behavior interventions focused on multiple risk behaviors among different groups for further enlarging the effects on cancer prevention.

Typology of Fashion Product Consumers: Application of Mixture-model Segmentation Analysis

  • Kim, Yeon-Hee;Lee, Kyu-Hye
    • 한국의류학회지
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    • 제35권12호
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    • pp.1440-1453
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    • 2011
  • Proper consumer segmentation is receiving more attention from industry professionals as markets become more diverse and consumer-centered. Researchers have recognized the limitations of the traditional cluster analysis technique and this research study analyzes market segmentation using Mixture-model or latent-class segmentation. This study used a questionnaire to determine the characteristics of clothing shoppers using a new technique that proved its superiority over traditional techniques. Questions included items measuring fashion shopping behavior, store choice criteria, apparel consumption styles, price perception by product type, and demographic characteristics. Data were collected from 1074 males and females in their 20s and 30s through an online survey. SPSS 16.0 and Latent GOLD 4.0 were used to analyze the data. The ideal typology of clothing shoppers using the Mixture-model were: 'brand loyalty orientated group', 'group of conservative late 30s', 'group of pleasure-emotion early 20s', 'value oriented consumer product with high-income group', 'group of eco/symbol oriented consumer', and 'group of utility/goal oriented male consumer'. This study showed differences in fashion product purchasing behavior by conducting market segmentation for clothing shoppers using the Mixture-model.

Phenotypes of allergic diseases in children and their application in clinical situations

  • Lee, Eun;Hong, Soo-Jong
    • Clinical and Experimental Pediatrics
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    • 제62권9호
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    • pp.325-333
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    • 2019
  • Allergic diseases, including allergic rhinitis, asthma, and atopic dermatitis, are common heterogeneous diseases that encompass diverse phenotypes and different pathogeneses. Phenotype studies of allergic diseases can facilitate the identification of risk factors and their underlying pathophysiology, resulting in the application of more effective treatment, selection of better treatment responses, and prediction of prognosis for each phenotype. In the early phase of phenotype studies in allergic diseases, artificial classifications were usually performed based on clinical features, such as triggering factors or the presence of atopy, which can result in the biased classification of phenotypes and limit the characterization of heterogeneous allergic diseases. Subsequent phenotype studies have suggested more diverse phenotypes for each allergic disease using relatively unbiased statistical methods, such as cluster analysis or latent class analysis. The classifications of phenotypes in allergic diseases may overlap or be unstable over time due to their complex interactions with genetic and encountered environmental factors during the illness, which may affect the disease course and pathophysiology. In this review, diverse phenotype classifications of allergic diseases, including atopic dermatitis, asthma, and wheezing in children, allergic rhinitis, and atopy, are described. The review also discusses the applications of the results obtained from phenotype studies performed in other countries to Korean children. Consideration of changes in the characteristics of each phenotype over time in an individual's lifespan is needed in future studies.

Comparison of Cardiovascular Risk Profile Clusters Among Industrial Workers

  • Hwang, Seon-Young;Lee, Ji-Hyun
    • 대한간호학회지
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    • 제35권8호
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    • pp.1500-1507
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    • 2005
  • Purpose. The purpose of this study was to identify subgroups of the physical and behavioral risk profiles for cardiovascular disease among industrial workers, and to examine predicting factors for the subgroups. Sample and Method. Health records of 2,616 male and female workers aged 19-56 years who were employed in an airplane manufacturing industry were analyzed. Data were analyzed using the Latent class cluster analysis. Results. Four different clusters (two high-risk groups, one low-risk group, and one normal group) were found and these clusters were significantly different by age, gender, and work type (p < .05 ). The two high-risk groups had higher chances of drinking alcohol, elevated BMI, FBS, total cholesterol, having hypertension, and were significantly older, and had relatively high chances of being day workers rather than other groups. The low-risk group had higher chances of drinking alcohol, higher BMI and total cholesterols compared to normal group, and highest portions of current smokers and shift workers in the four clusters and their mean BP was within prehypertension criteria. Conclusion. Industrial nurses should guide the lifestyle behaviors and risk factors of the high risk groups for CVD and need to intervene early for behavioral change for the low-risk group who are young and shift workers. Age, and work environment should be considered in planning for targeted preventive interventions for industrial workers.

장소별 완속충전기 적정 보급 비율에 관한 연구 : 전기차 이용자의 통행 및 충전행태에 따른 이질성을 중심으로 (Exploring a Balanced Share of Slow Charging Options by Places Based on Heterogeneous Travel and Charging Behavior of Electric Vehicle Users)

  • 이재현;윤서연;김현미
    • 한국ITS학회 논문지
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    • 제21권6호
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    • pp.21-35
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    • 2022
  • 최근 정부의 적극적인 지원정책과 함께 전기차 이용자들이 급증하고 있으며, 이로 인해 이용자 중심의 충전인프라 구축에도 많은 관심을 쏟아지고 있다. 다양한 정책의 수립과 함께 건물 특성에 기반한 총량적인 전기차 충전기 보급대수 기준은 마련되고 있으나, 장소별 특성에 기반한 완속과 급속충전기 적정 보급 비율에 대한 연구는 제한적이다. 이에 본 연구에서는 전기차 이용자들을 대상으로 진행한 설문조사를 통해 수집한 장소 유형별 공용 완속충전기 보급 비율 자료를 바탕으로 적정 보급비율을 도출하고, 개인별로 충전 환경 요구가 어떻게 차별적으로 유형화되고 이들이 어떠한 특성과 연관되는지 분석하였다. 분석 결과, 10% 이하의 완속 충전기가 필요한 유형, 40-60% 수준의 완속충전기가 필요하여 완속과 급속충전기의 균등 분배가 필요한 유형, 완속이 80% 이상 필요한 유형 등 총 세 가지 장소 유형을 도출할 수 있었다. 또한 잠재계층 군집분석을 통해 개인별로 서로 다른 장소유형별 완속충전기 필요 수준을 분류한 결과 5개 군집으로 유형화할 수 있었으며, 이들은 사회경제적 변수, 차량의 특성, 통행 및 충전행태와 연관된 것으로 나타났다. 특히, 충전행태와 주말 통행행태 그리고 성별, 소득과의 연관성이 높은 것으로 나타났다. 본 연구의 분석결과는 향후 충전인프라 정책 수립 및 전기차 시장의 변화에 따른 충전인프라 보급 기준 마련에 활용될 수 있을 것으로 사료된다.