# Krzysztof Nowicki

Professor, PhD## Research areas and keywords

### UKÄ subject classification

**Probability Theory and Statistics**

### Keywords

- Statistical Analysis, Probability, Networks

### Research

My research in statistical modelling of networks focuses on developing statistical and probabilistic techniques for understanding aspects of networks even when we are only able to observe part of one, when data are missing about relations between certain pairs or when the measurement of the network variables studied was faulty. These models are able to represent the heterogeneity of a network’s structures by including unique characteristics of its actors. They also allow us to explain the structure of a network using so-called block models and mixture graph models.

My research is also in the approximation of tail probabilities of sums of arbitrary random variables, which in many applications are required to measure the magnitude of the sum of random phenomena. In particular, the focus is on approximations of the order of magnitude of the quantiles of the sums.

### Teaching

Survey sampling, financial statistics, intermediate course in probability & statistics, graduate course in probability.

## Recent research outputs

Research output: Contribution to journal › Article

Research output: Working paper

Research output: Contribution to journal › Article