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For years, the impending enrollment cliff has been a regular topic amongst higher education officials. With this event slated to hit undergraduate programs by 2025, it is anticipated that graduate schools will begin feeling the impact by 2029. By examining factors influencing graduate student college choice, enrollment managers can identify ways to offset the decline in eligible graduate students. This study looked at applicants’ decisions to enroll or not enroll over a 5-year period at a public, research-intensive institution. The results of this study provided insight into the individual and academic factors that influence college choice, while also measuring the impact that the length of time from application to admission has on a student's decision to enroll or not enroll. By identifying these influencers and determining which factors universities can control, enrollment managers will have a better understanding of where to invest their time and resources when it comes to graduate recruitment. Historically, master’s and doctoral programs have been focused on selective enrollment, while the responsibility for institutional growth has fallen on undergraduate recruitment. However, administrators, faculty, and enrollment managers will need to reinvent how they think about recruitment and admissions if they are going to survive the impending enrollment cliff. Planning for the fall in graduate student enrollment now will empower higher education administrators to successfully navigate the fluctuation in the number of qualified graduate applicants before the enrollment cliff hits graduate schools.

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<p>Platforms are now everywhere in our society. Some platforms share real-time information such that people can refer to many aspects, i.e., transportation, weather, news, etc. For example, online learning platforms can play a significant role in accelerating learning through things like providing more real-time feedback loops. Due to the recent innovation in mobile devices as well as faster networks, live streaming platforms become a new trend. Several usages of live streaming platforms are gaming experience sharing such as Twitch, or shopping experience like Amazon Live. My dissertation studies the strategic designs of different online platforms, especially how information affects users’ strategic behaviors and how it creates<br> different market outcomes.</p>

In dieser Arbeit untersuchen wir einige Möglichkeiten, financial und soziale Netzwerke zu analysieren, ein Thema, das in letzter Zeit in der ökonometrischen Literatur große Beachtung gefunden hat. Kapitel 2 untersucht den Risiko-Spillover-Effekt über das in White et al. (2015) eingeführte multivariate bedingtes autoregressives Value-at-Risk-Modell. Wir sind an der Anwendung auf nicht stationäre Zeitreihen interessiert und entwickeln einen sequentiellen statistischen Test, welcher das größte verfügbare Homogenitätsintervall auswählt. Unser Ansatz basiert auf der Changepoint-Teststatistik und wir verwenden einen neuartigen Multiplier Bootstrap Ansatz zur Bewertung der kritischen Werte. In Kapitel 3 konzentrieren wir uns auf soziale Netzwerke. Wir modellieren Interaktionen zwischen Benutzern durch ein Vektor-Autoregressivmodell, das Zhu et al. (2017) folgt. Um für die hohe Dimensionalität kontrollieren, betrachten wir ein Netzwerk, das einerseits von Influencers und Andererseits von Communities gesteuert wird, was uns hilft, den autoregressiven Operator selbst dann abzuschätzen, wenn die Anzahl der aktiven Parameter kleiner als die Stichprobegröße ist. Kapitel 4 befasst sich mit technischen Tools für die Schätzung des Kovarianzmatrix und Kreuzkovarianzmatrix. Wir entwickeln eine neue Version von der Hanson-Wright- Ungleichung für einen Zufallsvektor mit subgaußschen Komponenten. Ausgehend von unseren Ergebnissen zeigen wir eine Version der dimensionslosen Bernstein-Ungleichung, die für Zufallsmatrizen mit einer subexponentiellen Spektralnorm gilt. Wir wenden diese Ungleichung auf das Problem der Schätzung der Kovarianzmatrix mit fehlenden Beobachtungen an und beweisen eine verbesserte Version des früheren Ergebnisses von (Lounici 2014). / In this work we explore some ways of studying financial and social networks, a topic that has recently received tremendous amount of attention in the Econometric literature. Chapter 2 studies risk spillover effect via Multivariate Conditional Autoregressive Value at Risk model introduced in White et al. (2015). We are particularly interested in application to non-stationary time series and develop a sequential test procedure that chooses the largest available interval of homogeneity. Our approach is based on change point test statistics and we use a novel Multiplier Bootstrap approach for the evaluation of critical values. In Chapter 3 we aim at social networks. We model interactions between users through a vector autoregressive model, following Zhu et al. (2017). To cope with high dimensionality we consider a network that is driven by influencers on one side, and communities on the other, which helps us to estimate the autoregressive operator even when the number of active parameters is smaller than the sample size. Chapter 4 is devoted to technical tools related to covariance cross-covariance estimation. We derive uniform versions of the Hanson-Wright inequality for a random vector with independent subgaussian components. The core technique is based on the entropy method combined with truncations of both gradients of functions of interest and of the coordinates itself. We provide several applications of our techniques: we establish a version of the standard Hanson-Wright inequality, which is tighter in some regimes. Extending our results we show a version of the dimension-free matrix Bernstein inequality that holds for random matrices with a subexponential spectral norm. We apply the derived inequality to the problem of covariance estimation with missing observations and prove an improved high probability version of the recent result of Lounici (2014).

Listan över influerare som har gjort skönhetsingrepp kan göras lång. För att nämna ett exempel har Bianca Ingrosso med ett följarantal på 343 000 på Youtube talat öppet om att hon gjort lipfillers (Ingrosso, 2020). Dessa inlägg där influerare talar om hur de korrigerar sin kropp i kombination med att de unga är i majoritet på internet och sociala medier (Svenskarna och internet 2019) ligger till grund för vår vilja att genomföra denna undersökning. Syftet med denna studie är att undersöka hur influerares reklam och framställning av skönhetsingrepp kan skapa betydelse för hur unga kvinnor ser på den egna kroppen. För att genomföra studien har vi använt oss av sex stycken kvalitativa intervjuer med kvinnor i åldrarna 15–17 år. Intervjuerna har spelats in och transkriberats och materialet har sedan analyserats för att besvara våra frågeställningar. Utifrån våra intervjuer kan vi se att influerares sätt att tala om och göra reklam för skönhetsingrepp har betydelse för unga kvinnors attityder till den egna kroppen. Några av respondenterna har även uttryckt att de blivit osäkra gällande sin egen kropp efter att ha sett inlägg gällande skönhetsingrepp från en influerare. Vi kan tydligt se att respondenterna tror att unga kvinnor är den grupp som påverkas mest av influerares framställning av skönhetsingrepp. Intervjuerna visar att respondenterna tar del av ett dominerande skönhetsideal på sociala medier och de beskriver idealet som att man ska vara smal, lång och vacker. Vi kan tydligt se, genom de analyserade intervjuerna, att de unga kvinnorna som deltog i denna studie är kritiska till influerare som talar om och gör reklam för skönhetsingrepp, då de tycker att det uppmanar andra till att korrigera sin kropp. Trots kritiken så spelar influerare en stor roll i de unga kvinnornas liv och de uttrycker att de får inspiration av influerare gällande var och vad man äter, hur man klär sig och hur man tränar. Vi kan därmed se en viss ambivalens i respondenternas svar då de följer specifika influerare samtidigt som de riktar kritik gentemot dessa. / The list of influencers who has had cosmetic procedures done can be made long. To mention one example, Bianca Ingrosso with 343 000 followers on Youtube, has spoken openly about her lip fillers (Ingrosso 2020). These types of posts, where influencers talk about how they correct their body, in combination with the fact that young people are a majority of the internet and social media users (Svenskarna och internet 2019) forms the basis of our motivation to conduct this study. This study aims to analyze whether, and if so, how influencers advertising and speech about cosmetic procedures contribute in creating meaning regarding how young women view their own body. This study was conducted with six qualitative interviews, with women in age 15-17. The interviews have been recorded and transcribed and the material has been analyzed to answer our research questions. Throughout our analyzed interviews can we see that influencers' speech and advertising about cosmetic procedures are meaningful regarding young women's attitudes to their own body. Some of the respondents expressed that they felt insecure about their own body after seeing an influencer talk about cosmetic procedures. We can also see that the respondents think that young women as a group of people are affected by influencers' opinions about cosmetic procedures. In the interviews, we can also see that the respondents take part in constructing a dominating beauty ideal on social media and they define the ideal as being skinny, tall and beautiful. Clearly the young women who took part in this study are critical of how influencers talk and do commercials about cosmetic procedures, they think influencers tell others to correct their body. Despite the criticism, the young women in this study are still inspired by influencers, regarding where and what they eat, how they dress and how they work out. We can clearly see some ambivalence in the way the respondents answer as they follow specific influencers while they also are criticizing them.

This diploma thesis discusses Instagram as a means for spreading trends in gastronomy with a focus on gastronomy and related trends in the field specifically from the Czech Republic. The author tries to map the influences that the online environment can have on their formation, especially the social network Instagram. After a thorough acquaintance with the environment of social networks, the social network Instagram, its influence on the spread of experiences, trends and the media environment in general, is described in more detail. The author seeks to clarify whether what is happening on this network can guide the direction of what is popular in the gastronomic environment, understand the role that well-watched creators from Instragram play in society and what it means for ordinary users to share food experiences. "Influential" users from the gastronomic sphere on Czech Instagram and their further connection with the media environment are presented. In the research, the author determines, via the form of a structured questionnaire (which was attended by 1143 respondents from the environment of social networks), what role Instragram plays in spreading gastronomic trends in the Czech Republic. The data obtained is supplemented with opinions based on interviews with representatives from the Czech...