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The structure of social networks, and people's position within these networks, are important predictors of many individual and group-level outcomes. One type of social networks that is regularly studied are the mutually interdependent relations of friends. This thesis focusses on friendship networks between adolescents in the context of schools. Arguably the most important and consistently found regularities in adolescent friendship networks are i) the tendency of friendships to be mutual, called reciprocity; ii) their tendency to cluster in groups, known as transitivity; and iii) the tendency of friendships to be present between those that are similar to one another, called homophily. Various social theories originating in different disciplines have theoretically proposed and empirically found micro-mechanisms that explain the regular occurrence of these substructures in friendship networks. This thesis introduces a framework of how the relation between these different networks tendencies can be understood. I propose that each of the three network evolution mechanisms can be connected to a type of social situation in which friends interact to form and maintain their friendships. Social situations that are dyadic and only involve two persons are connected to reciprocal friendships. Group-based social situations, on the other hand, are related to transitivity and homophily, where the groups are either defined socially or through common characteristics. Starting from this proposition, I suggest that when two adolescents share one forum for interaction with one another, i.e. they regularly meet within one of the social situations, meeting in additional other situations does not increase the likelihood of a friendship tie existing as much as could be expected from the sum of the effect of meeting in either situation. Consequently, I expect a negative interaction between the different network mechanisms. After a series of empirical analyses that support the outlined reasoning, I use the developed perspective to investigate how the micro-mechanisms contribute differentially to the creation of newly formed friendships and to the maintenance of already existing friendships. Finally, I show how a situational understanding of friendship can be used to differentiate which friendships are most important for social influence and for peer pressure.

The Work-Based Project (WBP) set out to explore how international students in a Swiss hospitality institution manage to cope with two quite different cultures to where they came from i.e. the Swiss national culture and the British academic culture. Previous research on international students have been in locations where the host culture student is in plentiful supply which is a way to help the international student adjust socioculturally. Within this WBP, the student body is made up of mainly international students and very few Swiss students. Concepts that were used to assist the exploration of this topic include: what influenced the choice of Switzerland and the institution as a place to study, along with how the information was searched for (Mazzarol and Soutar’s, 2002 Push-Pull Model; The Model of International Students’ Preferences by Cubillo, Sánchez and Cerviño, 2006). Hyde’s (2012) adaptation of Oberg’s 1960 stages of adaptation explored culture shock as a concept followed by Berry’s (1997) acculturation and coping strategies. It investigated the use of friendship networks as a way to help students cope in this new environment (Bochner, McLeod and Lin, 1977; Schartner, 2015). These models were used to provide a framework for the questioning used in the gathering of the primary research. The study is applied in nature and using a case study allowed for the exploration of the rich detail that was needed to understand how the international student feels in this environment and how they cope with it in an effort to instigate change as a result of the findings. Focus groups were used as a scoping tool to identify the key themes which were then developed into a questionnaire for distribution among the wider student body. The key findings indicate that reputation of Swiss hospitality education is influential in the decision making of the student. Word of mouth through previous students is a key way for the students to find out the information they believe they need. The findings revealed that the student views both the Swiss and academic culture of the institution as one and the same. The issue of culture shock is difficult to plot as there was such a mix of feelings identified when the decision to come to Switzerland is made and when the student arrives. The friendships that are generated have evolved since the creation of the Bochner et al (1977) Model and Schartner (2015) identified a newer group which could be added to this model i.e. friends back home as a way to help with psychological adjustment. The key conclusions drawn from the research indicate that the students use word-of-mouth to a great extent in preparation for their study abroad however, the information received is informal in nature. Those that used more sources of information felt they arrived more prepared. Friends were referred to throughout the study for many reasons however, the addition of the 4th group of friends i.e. friends back home, were used as a form of escape to cope with the challenges experienced (whether national or academic culture) due to both cultures being viewed as one and the same. Implications of this relate to how information is provided to the potential student Dissemination of the findings to those that prepare the students for their venture e.g. agents and those that have to help the student adjust upon their arrival e.g. institution members so that the student can adapt more quickly in the 18 weeks that they have to feel comfortable in their new environment.

In Chapter 2, I employ the educational production function to identify the different effects of making a friend of the same gender and the opposite gender in a school network. Unlike other gender peer effects literature that only quantifies the causal effects of the proportion of girls in an aggregated level, such as other students in the same class, grade, or dorm, I study the gender of the five best friends nominated by the student. I address the endogeneity of friendship composition by employing a novel set of instrumental variables for the number of same-gender and opposite-gender friends. We find that having more friends, especially in the early accumulation stage, lowers the test scores. We also explore the mechanisms. In Chapter 3, I investigate the role of social learning in enrollment decisions for a public pension scheme. All else equal, if a qualified rural resident moves from a community where no other co- villagers participate in the new pension scheme to a community that is fully covered by the pension scheme, the probability of an individual enrolling by 0.541 percentage point. We use robustness checks to illustrate that the estimated peer effects are not driven by the common unobserved factors, but by social interactions. In Chapter 4, we use the survey data on Chinese middle students and the instrumental variables method to explore the different effects of making friends with the same gender and the opposite gender in a school network on mental health. The empirical results find that having a larger number of same-gender friends improves mental health but having a larger number of opposite-gender friends hurts mental health. / Doctor of Philosophy / We need human connections. Along with other assets, such as money and skills, networks and relationships are resources that could help with economic outcomes in our daily lives. The rapid development of the Internet and the intelligentization of digital devices such as mobile phones have made it easier to establish relationships with others. They also generate much more data nowadays that makes it possible to study social relationships. In this dissertation, we mainly discuss two aspects of social networks. First, we use popularity as a measure of social capital and study how social capital influence middle school students' academic outcomes and mental health outcomes using Chinese data. Given that middle school students are in the embryonic stage of personal emotional development, we distinguish friends by of the same gender or not. We find that popularity with the same gender and the opposite gender differently impacts the outcomes. Second, it is intuitive that under the influence or pressure of a group, an individual tends to make his or her speech and behavior consistent with the group. Therefore, we are interested in if an individual's choice will be driven by other people's choices in the same group. We consider the adoption of a newly introduced pension program for rural residents in China. Besides demographic characteristics, a person's decision is also influenced by those around them. If a higher proportion of his or her co-villagers choose to join the pension plan, he or she is more likely to join.

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Introduction: Social networks have shown promise in curbing drug dependency and infectious diseases among marginalized populations. The purpose of this study is to elucidate how relationship strength in social networks is associated with risk behaviours for infectious diseases. Methods: Two reviews were conducted: 1) a systematic review exploring the association between risk behaviours and relationship strength 2) a review on the utilization of respondent driven sampling (RDS). We also analyzed network data to determine the association between recent injection drug use and recent crack use. Results: Our reviews revealed that few studies link relationship strength and risk behaviours; moreover, RDS is effective method of sampling from marginalized populations. Finally, our analysis demonstrated that close relationships are associated with drug use. Conclusion: “Close” relationships are important in arbitrating injection drug use and crack smoking. More research addressing the issues of using data from dynamic social processes and hard-to-reach populations is needed.

Introduction: Social networks have shown promise in curbing drug dependency and infectious diseases among marginalized populations. The purpose of this study is to elucidate how relationship strength in social networks is associated with risk behaviours for infectious diseases. Methods: Two reviews were conducted: 1) a systematic review exploring the association between risk behaviours and relationship strength 2) a review on the utilization of respondent driven sampling (RDS). We also analyzed network data to determine the association between recent injection drug use and recent crack use. Results: Our reviews revealed that few studies link relationship strength and risk behaviours; moreover, RDS is effective method of sampling from marginalized populations. Finally, our analysis demonstrated that close relationships are associated with drug use. Conclusion: “Close” relationships are important in arbitrating injection drug use and crack smoking. More research addressing the issues of using data from dynamic social processes and hard-to-reach populations is needed.