• 제목/요약/키워드: Structural Equation Model (SEM)

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Combined Model of Technology Acceptance and Innovation Diffusion Theory for Adoption of Smartwatch

  • Choe, Min-Ji;Noh, Ghee-Young
    • International Journal of Contents
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    • 제14권3호
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    • pp.32-38
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    • 2018
  • This study examined the factors influencing the intention to use smartwatches using the integrated model of technology acceptance model (TAM) and innovation diffusion theory (IDT). An online survey was conducted and the data were analyzed using the structural equation modeling (SEM). The results showed that the research model had an acceptable fit, and all paths, except for the one from the perceived ease of use to the intention to use, were supported. Regarding paths from IDT to TAM, it was observed that higher the compatibility, the users perceived greater usefulness. Additionally, both observability and trialability influenced the perceived ease of use. However, perceived ease of use affected the intention only through the mediated effect of perceived usefulness. The implication of the study lies on the major focus on the effects of users' perceptions regarding innovative characteristics of smartwatches on the intention to adopt and attempted to increase the explanatory power of the TAM and IDT by combining both.

구조식 모형에 대한 단계적 접근 (A Stagewise Approach to Structural Equation Modeling)

  • 이보라;박창순
    • 응용통계연구
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    • 제28권1호
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    • pp.61-74
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    • 2015
  • 최근 교육학, 경영학, 심리학 등 사회과학 뿐만 아니라 공정관리, 생물정보학 등 자연과학에서도 널리 사용되고 있는 구조식 모형(structural equation modeling)에서 잠재변수점수(latent variable score)는 직접 측정이 불가능한 잠재변수를 수량화한 추정치이다. 이 연구에서는 구조식 모형을 단계(stage)별로 분할하여 분석하는 단계별 구조식 모형(stagewise SEM; SSEM)을 제안하였다. 기존 방법은 모든 관측변수의 분산-공분산을 한꺼번에 고려하므로 독립변수인 외생잠재변수(exogenous latent variable)가 종속변수인 내생잠재변수(endogenous latent variable)에 의해 영향을 받는, 논리적으로 타당하지 않은 경우가 있다. 단계별 구조식 모형은 이런 문제점을 해결할 뿐만 아니라 모형의 복잡성을 낮추어 쉽게 해를 찾을 수 있으며, 분석과정에서 생성되는 잠재변수점수로 추가 분석도 용이하다.

국내 MIS 연구에서 구조방정식모형 활용에 관한 메타분석 (A Meta Analysis of Using Structural Equation Model on the Korean MIS Research)

  • 김종기;전진환
    • Asia pacific journal of information systems
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    • 제19권4호
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    • pp.47-75
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    • 2009
  • Recently, researches on Management Information Systems (MIS) have laid out theoretical foundation and academic paradigms by introducing diverse theories, themes, and methodologies. Especially, academic paradigms of MIS encourage a user-friendly approach by developing the technologies from the users' perspectives, which reflects the existence of strong causal relationships between information systems and user's behavior. As in other areas in social science the use of structural equation modeling (SEM) has rapidly increased in recent years especially in the MIS area. The SEM technique is important because it provides powerful ways to address key IS research problems. It also has a unique ability to simultaneously examine a series of casual relationships while analyzing multiple independent and dependent variables all at the same time. In spite of providing many benefits to the MIS researchers, there are some potential pitfalls with the analytical technique. The research objective of this study is to provide some guidelines for an appropriate use of SEM based on the assessment of current practice of using SEM in the MIS research. This study focuses on several statistical issues related to the use of SEM in the MIS research. Selected articles are assessed in three parts through the meta analysis. The first part is related to the initial specification of theoretical model of interest. The second is about data screening prior to model estimation and testing. And the last part concerns estimation and testing of theoretical models based on empirical data. This study reviewed the use of SEM in 164 empirical research articles published in four major MIS journals in Korea (APJIS, ISR, JIS and JITAM) from 1991 to 2007. APJIS, ISR, JIS and JITAM accounted for 73, 17, 58, and 16 of the total number of applications, respectively. The number of published applications has been increased over time. LISREL was the most frequently used SEM software among MIS researchers (97 studies (59.15%)), followed by AMOS (45 studies (27.44%)). In the first part, regarding issues related to the initial specification of theoretical model of interest, all of the studies have used cross-sectional data. The studies that use cross-sectional data may be able to better explain their structural model as a set of relationships. Most of SEM studies, meanwhile, have employed. confirmatory-type analysis (146 articles (89%)). For the model specification issue about model formulation, 159 (96.9%) of the studies were the full structural equation model. For only 5 researches, SEM was used for the measurement model with a set of observed variables. The average sample size for all models was 365.41, with some models retaining a sample as small as 50 and as large as 500. The second part of the issue is related to data screening prior to model estimation and testing. Data screening is important for researchers particularly in defining how they deal with missing values. Overall, discussion of data screening was reported in 118 (71.95%) of the studies while there was no study discussing evidence of multivariate normality for the models. On the third part, issues related to the estimation and testing of theoretical models on empirical data, assessing model fit is one of most important issues because it provides adequate statistical power for research models. There were multiple fit indices used in the SEM applications. The test was reported in the most of studies (146 (89%)), whereas normed-test was reported less frequently (65 studies (39.64%)). It is important that normed- of 3 or lower is required for adequate model fit. The most popular model fit indices were GFI (109 (66.46%)), AGFI (84 (51.22%)), NFI (44 (47.56%)), RMR (42 (25.61%)), CFI (59 (35.98%)), RMSEA (62 (37.80)), and NNFI (48 (29.27%)). Regarding the test of construct validity, convergent validity has been examined in 109 studies (66.46%) and discriminant validity in 98 (59.76%). 81 studies (49.39%) have reported the average variance extracted (AVE). However, there was little discussion of direct (47 (28.66%)), indirect, and total effect in the SEM models. Based on these findings, we suggest general guidelines for the use of SEM and propose some recommendations on concerning issues of latent variables models, raw data, sample size, data screening, reporting parameter estimated, model fit statistics, multivariate normality, confirmatory factor analysis, reliabilities and the decomposition of effects.

Application of Structural Equation Models to Genome-wide Association Analysis

  • Kim, Ji-Young;Namkung, Jung-Hyun;Lee, Seung-Mook;Park, Tae-Sung
    • Genomics & Informatics
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    • 제8권3호
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    • pp.150-158
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    • 2010
  • Genome-wise association studies (GWASs) have become popular approaches to identify genetic variants associated with human biological traits. In this study, we applied Structural Equation Models (SEMs) in order to model complex relationships between genetic networks and traits as risk factors. SEMs allow us to achieve a better understanding of biological mechanisms through identifying greater numbers of genes and pathways that are associated with a set of traits and the relationship among them. For efficient SEM analysis for GWASs, we developed a procedure, comprised of four stages. In the first stage, we conducted single-SNP analysis using regression models, where age, sex, and recruited area were included as adjusting covariates. In the second stage, Fisher's combination test was conducted for each gene to detect significant genes using p-values obtained from the single-SNP analysis. In the third stage, Fisher's exact test was adopted to determine which biological pathways were enriched with significant SNPs. Finally, based on a pathway that was associated with the four traits in common, a SEM was fit to model a causal relationship among the genetic factors and traits. We applied our SEM model to GWAS data with four central obesity related traits: suprailiac and subscapular measures for upper body fat, BMI, and hypertension. Study subjects were collected from two Korean cohort regions. After quality control, 327,872 SNPs for 8842 individuals were included in the analysis. After comparing two SEMs, we concluded that suprailiac and subscapular measures may indirectly affect hypertension susceptibility by influencing BMI. In conclusion, our analysis demonstrates that SEMs provide a better understanding of biological mechanisms by identifying greater numbers of genes and pathways.

IT중소기업의 리더십과 임파워먼트에서 MMR과 SEM 검증방법에 따른 팔로워십 조절효과분석 (The moderating effects Analysis of followership according to the MMR & SEM methods to leadership and empowerment in IT SMEs)

  • 이영신;박재성
    • 디지털산업정보학회논문지
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    • 제8권3호
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    • pp.199-212
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    • 2012
  • This study focuses on the influence of followership on leadership and empowerment, and to verify based on the control variables taken in IT SME's to enhance competitiveness through innovation and improvement plan that have been taken. Because there can be a lot of information to be taken, the laws of Moderated Regression Multiple analysis(MMR) were used. Amos, due to the moderating effect of Structural Equation Modeling(SEM) has been employed to re-verify the results seen with Moderated Regression Multiple analysis. The paper focuses on determining whether transformational leadership or transactional leadership is effective as shown by the levels of empowerment derived from these two types of leadership under study. As a result, both the Moderated Regression Multiple analysis and structural equation model searched information on transformational and followership for empowerment having moderating effects. In the Moderated Regression Multiple analysis, results showed that empowerment for leadership in business in the regulation of followership role appeared not to be seen. However, using the structural equation modeling, moderating effects have been found.

구조방정식 모델을 활용한 자동차 내장디자인의 고객감성 만족에 관한 연구 (A Study on Customer Satisfaction of Sensibility for Automotive Interior Design Using Structural Equation Model)

  • 전영호;백인기;신정태
    • 품질경영학회지
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    • 제28권4호
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    • pp.151-160
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    • 2000
  • There can be a hierarchy among sensibility vocabularies by degree of abstractness. The higher degree of adstractness, the more difficult measuring satisfaction of sensibility. The objective of this study is to quantify customer satisfaction of his/her sensibility by using hierarchy of sensibility and Structural Equation Model(SEM).

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LISREL을 이용한 과학에서의 태도에 관한 구조방정식모델의 구축 (Construction of a Structural Equation Model on Attitudes to Science Using LISREL)

  • 이경훈
    • 한국과학교육학회지
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    • 제17권3호
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    • pp.301-311
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    • 1997
  • The purpose of this study is to construct a structural equation model and to analyze causal relationships among variables related to attitudes to science using structural equation modeling(SEM) with LISREL VII. The sample consisted of 483 10th grade boys from a general high school in Pusan, Korea. The questionnaires (ABC-attitude scale: affection, behavioral intention, cognition scale of attitude towards science) were developed by the researcher through a pilot study. And other instruments have modified previous ones. Five instruments were used in this study: GALT(group assessment of logical thinking), MTSlS(modified test of science inquiry skill), ABC-attitude scale, MSAS(modified scientific attitude scale), CSAT(common science achievement test). Structural equation modeling with LISREL VII($J\ddot{o}reskog$ & $S\ddot{o}rbom,$ 1993) was employed to estimate the causal inferences about hypothesized relationships among observed data sets. Three competing models consisted of five latent variable(scientific thinking ability, science inquiry skill, attitude towards science, scientific attitude, science achievement) - lP(inquiry preceding) model, AP(attitude preceding) model and AM(attitude mediating) model - were developed. Among these competing models, IP model satisfied the observed data sets. The causal relationships among "attitudes to science" and other latent variables were reliably identified. According to the results of the present study, science inquiry skill was the most significant variable that can predict science achievement. But scientific thinking ability has not directly influenced science achievement. This study suggests that inquiry based teaching-learning processes should be offered to students for improvement of science achievement. At the same time, it seems to be important to develop positive attitude towards science. Understanding of relationships among variables related to attitudes to science will be helpful to the development of science curriculum and to the design of science teaching and learning process. LISREL has been recognized as a useful approach in testing a SEM. However, in this study, LISREL approach was estimated as much more useful method for research design.

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6시그마 챔피언의 변혁적 리더십이 창의성에 미치는 영향에 관한 연구 : 내재적 동기와 프로젝트 학습과 성장성과의 매개효과를 중심으로 (A Study of the Effects of Champion's Transformational leadership on Belts' Creativity: Based on Mediate Effects of Belts' Intrinsic Motivation and Project's Learning and Growth)

  • 양종곤;김진규
    • 품질경영학회지
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    • 제39권2호
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    • pp.256-270
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    • 2011
  • The study attempts to propose and test a causal research model using SEM (Structural Equation Model) to determine whether there is a relationship between six sigma champion's transformational leadership and belts' creativity based on the mediated effects of intrinsic motivation and project's learning and growth. The subjects of the study composed of 134 belts from manufacturing and service firms implemented six sigma. Empirical results show that transformational leadership is positively related to intrinsic motivation and project learning and growth. In addition, intrinsic motivation and project learning and growth are positively related to creativity. The results of the study imply that creativity of six sigma belts would be enhanced by implementation of six sigma projects and utilizing six sigma tools and methods.

Weblog 서비스 품질(wb-SERVQUAL)과 사용자 만족도, 충성도에 관한 구조적 관계 (The structural relationships among Weblog service quality(wb-SERVQUAL), user satisfaction and loyalty)

  • 김수연;여상표;황현석
    • 한국산업정보학회논문지
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    • 제11권5호
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    • pp.67-77
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    • 2006
  • 인터넷의 급속한 확산으로 가상공간에서의 활동이 증가함에 따라 인터넷을 기반으로 한 다양한 온라인 서비스가 제공되고 있으며, 이의 평가에 대한 많은 연구들이 수행되어 왔다. 그 중에서도 특히 온라인 서비스의 품질에 대한 평가지표와 품질측정 방법 등에 대해 많은 선행연구가 이루어져 왔다. 그러나 지금까지의 연구는 인터넷 서비스, 인스턴트 메신저, 게임, 포털 사이트 등 상업용 사이트에 대한 연구가 주를 이루고 있으며, 최근 널리 확산되고 있는 1인 미디어인 Weblog(Blog)에 대한 연구는 충분히 이루어지지 못하고 있다. 본 연구에서는 Weblog 서비스의 품질과 이용자 만족도, 충성도 간의 구조적 관계에 대하여 분석하 고자 한다. 이를 위하여 기존의 문헌연구를 통하여 일반적인 서비스 품질요인들을 도출하고, 이를 Weblog의 특성에 맞게 재구성한 wb-SERVQUAL을 제시하였다. 제시된 wb-SERVQUAL을 이용하여 실증조사를 실시하였고, 사용자들의 Weblog 활동을 통하여 나타나는 Weblog 서비스 품질과 만족도, 충성도와의 관계를 분석하기 위하여 구조방정식 모형(SEM, Structural Equation Model)을 이용하였다. 이러한 실증연구 방법을 통하여 보다 효과적인 Weblog의 운영을 위한 실무적 함의를 제공하였다.

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구조방정식(SEM)을 활용한 교통약자 이동편의시설의 중요도 분석 (Importance Factor Analysis on Mobility Facilities for the Transportation Disabled by Using Structural Equation Model)

  • 안우영;최리라
    • 대한토목학회논문집
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    • 제34권3호
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    • pp.939-945
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    • 2014
  • 현재 수립된 대부분의 교통약자관련 이동편의증진계획에서는 투자우선순위를 결정함에 있어 교통약자 이동편의시설의 설치율과 만족도간의 중요도(요인 적재량)에 대한 분석 없이 설치율 또는 만족도가 낮은 항목을 우선적으로 고려하여 투자우선순위를 결정하고 있다. 따라서 본 연구에서는 구조방정식(SEM: Structural Equation Model)을 이용하여 외생잠재변수(Exogenous Latent Variables)와 내생잠재변수(Endogenous Latent Variables)간의 인과관계를 통계적으로 검증하고 설치율과 만족도를 동시에 고려한 교통약자 이동편의시설의 투자우선순위 결정모형을 제시하였다. 분석결과 이동편의 시설가운데 이용자 만족도에 가장 큰 영향을 주는 시설로는 버스정류장, 횡단보도, 보도 순으로 분석되었다. 버스정류장시설 중 정류장연석의 높이, 보도시설 중 보도의 평탄성 그리고 횡단보도시설 중 보행신호등 설치에 대한 중요도가 높게 분석되었다.