• Title/Summary/Keyword: Difference-in-Differences model

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The Difference of Clothing Shopping Orientation Structure by the Type of Store Preferred (선택 점포 유형에 따른 소비자 의복 쇼핑 성향 구조 차이에 관한 연구)

  • Kim, Sae-Hee
    • Journal of the Korean Society of Clothing and Textiles
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    • v.32 no.3
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    • pp.373-384
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    • 2008
  • The propose of this study is to explore if the clothing shopping orientation[CSO] of consumers differs between the two types of preferred store when they purchase casual wears. A total of 413 answers from male and female consumers in their twenties were used for the analysis. The types of preferred store were grouped by the brand fame. Department stores, brand agencies/sales branches, and outlets constituted wellknown brand store group, and shopping malls, no brand street stores, and discount stores constituted unknown brand store group. The results are as follows. First, there were no significant differences in CSO dimensions except 'well known brand oriented' dimension between groups. Second, each group showed proper fitness for CSO structure model. Third, the relationships among dimensions within structure model were significantly different between groups. These mean that though it looks there are no differences between groups at the level of each dimension, but there are differences in the view of specific relationships among dimensions. Therefore, store managers must consider the complex CSO structure for marketing strategy development.

The Impact of Regional Warming On the Ozone Concentration According to the Differences in Meteorological Contribution in Each City over the South-Eastern Part of the Korean Peninsula (기후변화에 따른 도시별 기상기여도 차이가 고농도 오존분포에 미치는 영향)

  • Jeong, Yeo-Min;Lee, Hwa-Woon;Choi, Hyun-Jung
    • Journal of Environmental Science International
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    • v.20 no.3
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    • pp.405-416
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    • 2011
  • In order to clarify the impact of regional warming on the ozone concentration according to the differences in meteorological contribution in each city over the South-Eastern part of the Korean Peninsula, several numerical experiments were carried out. WRF - CMAQ model was used to access the ozone differences in each case, during the episode day. Meteorological contributions estimated by WRF command a reasonable feature on the dispersion of ozone concentrations in each city according to regional warming. This causes a difference in estimated ozone concentration. A higher ozone concentration difference tend to be forecasted in coastal cities than in upcountry city. Therefore, the emission reduction policy according to the regional warming should consider the characteristics of meteorological contribution of each city.

The Effect of Features and Motivators of Mobile Phone on Repurchasing Intention: Focusing on Difference Between Korea and Indonesia (휴대폰의 재구매 동기에 관한 국가간 비교 연구 : 한국과 인도네시아를 중심으로)

  • Lee, Jong-Oh;Whang, Jae-Hoon
    • Journal of Information Technology Applications and Management
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    • v.14 no.4
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    • pp.159-174
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    • 2007
  • The purpose of this research is to investigate the relationships among the perceived satisfaction, the perceived the trust, the commitment, the key features for mobile phone, the brand image, the switching cost and the repurchasing intention. We also examine the differences between Korean and Indonesian markets concerning the relationships of these key successfactors. The structural model is tested with the data form each of the sub-samples (i. e. Korean and Indonesian users taken separately). Properties of the casual paths, including standardized path coefficients, the significance of difference, and variance explained for trust, satisfaction, commitment and repurchasing in the hypothesized model, are presented. This study indicated that hardware (sound quality, LCD display, design) user interface (GUI, Menu, Key pad) and extra functions (camera phone, wireless internet, MP3 player) are the three important factors effecting the trust and the satisfaction. The proposed model has been newly tested from the technological prospective in order to get the more practical result. Following the model test, we conduct a test of the differences in path coefficients between Korean and Indonesian users. MSEM show that, compared to Korean market, Indonesian had more emphasized on extra-function for the mobile phone as well as giving more influence to the satisfaction from the brand image. It means Korean market consider the extra-function as basic or no-premium points. And the satisfaction has been effected by switching-cost in Korea but the trust in Indonesia. Other interesting result from the structural weight invariance indicate that, compared to Korean market, the brand-image has effected the satisfaction in addition to placing more the trust on determining the commitment in Indonesia.

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인터넷을 이용한 교수 - 학습 모형에 관한 연구

  • Kim, Chang-Su;Kim, Eun-Suk;Byeon, Yeong-Gye
    • 한국디지털정책학회:학술대회논문집
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    • 2004.05a
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    • pp.675-690
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    • 2004
  • A new way of teaching on the Internet can be called Web Based Instruction (WBI). WBI goes far above and beyond teaching in the school. It will have an impact on overall educational activity that will dramatically change many existing educational processes and persuade most teachers to change their conventional teaching methods. The main purposes of this research were to make a comparative study of academic achievement between expository lecture and web-based instruction, and to identify the difference in academic achievement of learning tasks in pre- and post- experiments of WBI. The conclusions of this study were as follows. First. there are no differences in academic achievement between expository lecture and teacher- directed web based instruction. Second, there are no differences in academic achievement between expository lecture and teacher-assisted web based instruction. Third, there is difference in academic achievement between teacher-assisted web based instruction and teacher-directed web based instruction. Fourth, there are no differences in academic achievement of reading tasks in pre- or post- experiments of teacher-directed web based instruction. On the basis of the research results and discussion, we finally present a Web-Application-Model (WAM) to encourage the usage of Internet as a useful teaching channel.

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A Study on the Characteristics of Lower Extremity Weight Bearing in Patients with Low Back Pain (요통환자의 기립시 하지체중 지지특성에 관한 연구)

  • Yoon, Hong-Il;Bae, Soo-Chan
    • The Journal of Korean Academy of Orthopedic Manual Physical Therapy
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    • v.5 no.1
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    • pp.59-74
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    • 1999
  • 66 patients with low back pain were evaluated to determine if any differences of weight bearing were existed between the same side leg that feel pain(pain side leg) and that without pain (non-pain side leg) of lower extremities while weight bearing. 66 patients were divided into 3 groups according to pain pattern such as low back pain only(26), radiating pain only(21) and low back pain with radiating pain (19). Control group were 28 normal persons. The weight bearing was rated by Limloader(Model LLD-2000, Ver 1.2) and analyzed by paired and independent t-test, one-way ANOVA, Dunan's analaysis and Pearson's correlation analysis. The results of this study were as follows : 1. In patient group, significant difference of weight bearing rating between pain side leg and non-pain side leg was found. There was borne significantly less weight bearing rating(14.68%) on the pain side leg(P<.001). 2. In normal group, there was no significant difference between left and right leg(P>.05). But there was significant difference(3.21%) in absolute difference of both leg(p<.001). 3. The difference of 1 and 2 was 11.47% : more difference of weight bearing rating between both legs in patient group than that of the control group(p<.001). 4. There were significant differences of weight bearing rating in those 3 groups : low back pain group(10.30%), radiating pain group (17.90%) and low back pain with radiating pain group (17.10%) (p<.001). 5. There was significant correlation between pain intensity and difference of weight bearing rating(p<.05). The severer pain intensity. the more difference of weight bearing rating was found. 6. There was no significant correlation between the age, height and duration of symptom, etc(p>.05).

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Childbirth and Socioeconomic Status Changes in Korean Women: Using Propensity Score Matching and Difference-in-Differences Method (출산과 여성의 사회경제적 상태 변화: 성향점수매칭과 이중차이를 활용한 분석)

  • Jung, Yun Sun;You, Chang Hoon;Kwon, Young Dae
    • The Journal of the Korea Contents Association
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    • v.19 no.10
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    • pp.667-676
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    • 2019
  • The purpose of this study was to assess the impact of childbirth on socioeconomic status changes of women. Data were collected from Korean Health Panel (2008-2015). A difference-in-differences model with propensity score matching was applied to assess the impact of childbirth on socioeconomic status changes. As a result, variables showing significant differences in the interaction terms indicating the impact of birth were the savings, economic activity, and occupational status. The impact of birth were significant in decreasing the amount of savings and negatively affecting women's economic activities, but in increasing the probability of full-time and regular employees in occupational status. Childbirth appears to have a negative impact on the home economics and socioeconomic status of women. The belief that home economies can be stabilized even after childbirth should be established, and a long-term and sustained support plan should be set up to realize this belief.

Long-term International Oil Trade Model for the Analysis of Oil Price and Economic Growth (세계원유가격 및 경제성장분석을 위한 장기국제원유무역모형)

  • Kim, Se-Heon
    • Journal of Korean Institute of Industrial Engineers
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    • v.11 no.2
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    • pp.165-172
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    • 1985
  • Since energy consumption of developing countries is expected to grow rapidly over the coming decades, the oil-importing developing countries are likely to encounter chronic balance-of-payments difficulties. To analyze the quantitative impacts of this problem, we develop a computable model of international trade. This paper presents four alternative cases - varying the assumptions with respect to energy supplies. This shows that relatively small difference in supplies can lead to 100% differences in the energy prices projected for 1990.

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Analysis of the Health Expenditure and Medical Usage Difference of the Baby Boomers between Male and Female: Depression as a Mediators (베이비붐세대의 남녀 간 의료비 지출 및 의료이용 차이: 우울을 매개변수로)

  • Jeong, Ji Yun;Jeong, Jae Yeon;Cha, Sun Jung;Lee, Hae Jong
    • Health Policy and Management
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    • v.29 no.2
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    • pp.160-171
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    • 2019
  • Background: This study purposed to compare the difference on medical utilization and health expenditure of baby boomer generation by depression between gender. Methods: Korea Welfare Panel Survey 2016, provided by the Korea Institute for Health and Social Affairs, was used for the analysis. For the research, we used the two-part model, yes or no of use (part 1), and frequency of use (part 2) for medical utilization. The dependent variables are the whether or not to use of hospitalization services, outpatient services, length of stay, outpatient service visits, and health expenditure. And the independent variables are used as the predisposing (education, spouse presence), enabling (insurance type, private insurance, economic activity, income), and need (chronic disease, self-rated health, disability) factors in the Andersen behavior model. Depression was used as intervening variables. Structural equation model and multiple group analysis by gender were used. Results: There were differences in the medical care usage and cost between men and women in baby boomer. For men, mediating effects of depression were present at the hospitalization (yes/no), length of stay, and health expenditure. On the other hand, for women, the mediating effect of depression was found only at the outpatient visits. Specially, depression was working at the medical services by the different way between gender. The size of effect (multiple group analysis) was affected by significant differences between men and women. Conclusion: This study found that the mediating effect of depression is increased medical usage and health expenditure and the effect factors are different by gender. Therefore, it is necessary to establish a medical care policy considering the socio-economic characteristics of baby boomers.

Differences in Attitude -Based on Advertising Model and Consumer Product Involvement- (제품관여도, 광고모델에 따른 소비자 태도차이 연구)

  • Rhee, Young-Ju
    • Journal of the Korean Society of Clothing and Textiles
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    • v.34 no.10
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    • pp.1658-1670
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    • 2010
  • This study investigates the differences in advertisement attitude, brand attitude, and purchase intention based on advertising model and consumer product involvement. A total of 100 respondents in high involvement and 100 respondents in low involvement categories were exposed to the advertisements of a cosmetic brand using 4 different model types: celebrity endorser, expertise endorser, ordinary person as an endorser, and no endorser. The experiment was planned as $2{\times}4$ types including high/low involvement and 4 different model types (25 respondents each). After looking at an advertisement for 1 minute, respondents were asked to answer a survey measuring advertisement attitude, brand attitude, and purchase intension. The results of this study showed that 6 hypotheses were supported and there was a significant difference between the high involvement and low involvement group depending on the advertising models used as well as the advertisement that influence advertisement attitude, brand attitude, and purchase intension. High involvement consumers showed the most favorable advertisement attitude on an advertisement with an expertise endorser, but low involvement consumers showed the most favorable advertisement attitude on an advertisement with a celebrity endorser. High involvement consumers showed the most favorable brand attitude on an advertisement with an expertise endorser whereas low involvement consumers showed the most favorable brand attitude on an advertisement with a celebrity endorser. High involvement consumers showed the highest purchase intention on an advertisement with an expertise endorser whereas low involvement consumers showed no difference in purchase intention depending on advertisement models. This study shows that marketers should differentiate advertising strategies based on consumer involvement.

A Study on Differences of the Effects of Firefighter's Traumatic Experiences on Their Burnout, Depression, Anxiety and Social Relationships (소방공무원이 지각한 외상경험이 직무소진과 우울, 불안 및 대인관계에 대한 차이 비교 연구)

  • Lee, Seobin;Byun, Sanghea
    • Journal of Korea Society of Digital Industry and Information Management
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    • v.14 no.1
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    • pp.121-133
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    • 2018
  • The goal of this study is to investigate the factors affecting firefighter's traumatic experiences and to examine and compare the differences of how those factors contribute to firefighter's burnout, depression, anxiety and social relationships. This study suggests that it is imperative for firefighters to have mindfulness, which brings mental and emotional healing, for their job-satisfaction. To empirically examine the research model of this study, the questionnaire survey was carried out to firefighters in InCheon Metropolitan City for two weeks; from October 19thto November 3rd, 2017. Out of 180 questionnaires, 170were retrieved. Total number of 160 questionnaires are empirically examined this study, excluding10bad survey responses. The t-test was conducted to determine whether there exist differences by gender among traumatic experienced firefighters, and a meaningful difference was found from perceived intrusiveness, a sub factor to traumatic experiences. Male firefighters showed higher mean than that of female firefighters in perceived angle, evasion and intrusiveness. Second, the t-test was conducted to determine whether there exist differences by gender in firefighter's burnout, but no meaningful differences were found. Female firefighters showed higher mean in emotional exhaustion, impersonalization and in decrease in self-achievements. Third, the t-test was conducted to determine whether there exist differences by gender in firefighter's depression and relationships, but no meaningful differences were found.