Haiko Lietz

• Dr.
• PostDoc Position at GESIS - Leibniz-Institute for the Social Sciences

We assess the empirical development of scientific homogenization and differentiation processes in terms of group development comparing U.S. and German sociology from 2004 to 2019. We introduce hierarchical multi-layered Bayesian stochastic block models to the issue of scientific group development. Based on publication data from Scopus, we analyze g...

Inequality prevails in science. Individual inequality means that most perish quickly and only a few are successful, while gender inequality implies that there are differences in achievements for women and men. Using large-scale bibliographic data and following a computational approach, we study the evolution of individual and gender inequality for...

The hipster paradox in Electronic Dance Music is the phenomenon that commercial success is collectively considered illegitimate while serious and aspiring professional musicians strive for it. We study this behavioral dilemma using digital traces of performing live and releasing music as they are stored in the \textit{Resident Advisor}, \textit{Jun...

The hipster paradox in Electronic Dance Music is the phenomenon that commercial success is collectively considered illegitimate while serious and aspiring professional musicians strive for it. We study this behavioral dilemma using digital traces of performing live and releasing music as they are stored in the Resident Advisor, Juno Download, and D...

“Big” digital behavioral data increasingly allows large-scale and high-resolution analyses of the behavior and performance of persons or aggregated identities in whole fields. Often the desired system of study is only a subset of a larger database. The task of drawing a field boundary is complicated because socio-cultural systems are highly overlap...

Padgetts und Powells Thema ist die Erklärung institutioneller Reproduktion und Veränderung anhand konkreter multiplexer Mechanismen. Die beiden Sozialwissenschaftler mit Hintergrund in der Komplexitätstheorie verbinden Netzwerkanalyse mit Organisationstheorie und historischem Institutionalismus. Das in ihrem Buch durchexerzierte Mantra lautet: Auf...

Ein » small world «-Netzwerk ist ein stochastisches Graphmodell, das zwischen Ordnung und Zufall interpoliert und die zentralen Eigenschaften beider Pole bewahrt. Das Watts/Strogatz-Modell ist ein Beitrag zum Kleine-Welt-Problem. Milgram et al. (→ 1967; Travers und Milgram 1969) haben experimentell gezeigt, dass zufällig ausgewählte Probanden in de...

Although considerable research has concentrated on online campaigning, it is still unclear how politicians use different social media platforms in political communication. Focusing on the German federal election campaign 2013, this article investigates whether election candidates address the topics most important to the mass audience and to which e...

Although considerable research has concentrated on online campaigning, it is still unclear how politicians use different social media platforms in political communication. Focusing on the German federal election campaign 2013, this article investigates whether election candidates address the topics most important to the mass audience and to which e...

Although considerable research has concentrated on online campaigning, it is still unclear how politicians use different social media platforms in political communication. Focusing on the German federal election campaign 2013, this article investigates whether election candidates address the topics most important to the mass audience and to which e...

Scientific collaborations shape ideas as well as innovations and are both the substrate for, and the outcome of, academic careers. Recent studies show that gender inequality is still present in many scientific practices ranging from hiring to peer-review processes and grant applications. In this work, we investigate gender-specific differences in c...

Assessing political conversations in social media requires a deeper understanding of the underlying practices and styles that drive these conversations. In this paper, we present a computational approach for assessing online conversational practices of political parties. Following a deductive approach, we devise a number of quantitative measures fr...

Many indicators exist that measure different aspects of scientific productivity, impact, and collaboration. Longitudinal analyses are commonly used to identify developments and changes. However, indicators to quantify dynamics are largely missing and scholarly articles documenting the use of a dynamics indicator are rare. This paper aims at contrib...

We introduce two novel ways to capture the impact benefits two countries receive from collaborations. For both indicators we compare the value of a specific collaboration with the value of average collaborations for each of the countries. As we restrict our analysis to only two-country collaborations and calculate the values for each scientific fie...

Self-similarity signals the emergence of an identity which re-enacts itself on different length-scales. There is tremendous evidence for the self-similarity of the science system, both in terms of its social (collaboration) and cultural (citation) structure. Classical models, recently re-formulated and proven in network language, explain the emerge...

What is emerging science, and how can it be measured if a eld, sub-eld, or subject area is emerging? Often emerging science is diagnosed as a research front using citation analysis. Bettencourt et al. employ collaboration analysis and concentrate on structural properties of the process of emergence itself. According to the model the establishment o...